Origin:
1350–1400; Middle English addicio(u)n < Latin additiōn- (stem of additiō), equivalent to addit(us), past participle of addere to add (ad- ad- + di- put + -tus past participle suffix) + -iōn- -ion

Related forms

pre·ad·di·tion, noun

re·ad·di·tion, noun

Can be confused: addition, edition.

Synonyms
1. joining. 3, 4. increase, enlargement; increment; accession, 4. supplement; appendix. Addition, accessory, adjunct, attachment mean something joined onto or used with something else. Addition is the general word, carrying no implication of size, importance, or kind, but merely that of being joined to something previously existing: an addition to an income, to a building, to one's cares. An accessory is a subordinate addition to a more important thing, for the purpose of aiding, completing, ornamenting, etc.: accessories to a costume. An adjunct is a subordinate addition that aids or assists a main thing or person but is often separate: a second machine as an adjunct to the first. An attachment is an accessory part that may be easily connected and removed: a sewing machine attachment for pleating.

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Link To addition

Example Sentences

But in addition to the burdens of geography, the colonies must also cope with a capricious and neglectful colonial regime.

In addition to welcoming summer, there is a scientific reason for all the excitement surrounding this day.

I've heard that the police are now using lasers in addition to radar to catch speeders on the highway.

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But in addition to the burdens of geography, the colonies must also cope with a capricious and neglectful colonial regime.

In addition to welcoming summer, there is a scientific reason for all the excitement surrounding this day.

I've heard that the police are now using lasers in addition to radar to catch speeders on the highway.

In addition to being used as mixing bowls, the abalone shells served as storage containers.

Bright colors and dramatic forms make dahlias an exciting addition to the summer border.

If you've got kids who are working on addition skills, they may enjoy this one.

With luck, that fate will be avoided by the latest addition to the list.

In addition to light, the sun radiates heat and a steady stream of charged particles known as the solar wind.

But the addition of water still made the mixture firmer.

In addition they offer year-round programming for residents, school groups, community groups and tourists.

Cut into halves for a beautiful addition to this simple dessert.

The iBar is an essential addition to any lush's repertoire that may already include beer robots and wine braziers.

But the addition of these two to the repertoire is important for two reasons.

In addition to keeping you physically fit, exercise may protect your brain, according to a new study.

In addition to its renowned collection, the museum presents temporary exhibitions and diverse public and education programs.

The second time around, the couple carried details from the addition throughout the home.

In addition to capturing amazing images of the phytoplankton blooms, satellite data is one of the only ways to study them.

These reductions will be in addition to the loss of tens of thousands of other temporary jobs created to process dud mortgages.

The fire hydrant of the future will have a new mission in addition to fighting fires.

But then there's no more building peat, no more addition of roots into the substrate.

Frozen watermelon is the perfect addition to a summer cooler.

For that reason, the event also served as a focus group and sales pitch in addition to giving blind people confidence in cars.

In addition to hormones, there are other chemicals that can be used to regulate gene expression.

In addition to the historic house, four special exhibitions are on view.

There was even room to insert a stairway to the second-floor addition without expanding beyond the house's original footprint.

The above thought is smart and doesn t require any further addition.

Each color rod represents a different length, and they are used to help elementary students master simple addition and fractions.

Chandler, who makes furniture and sculptures in addition to designing landscapes, had used scrap steel in his work for years.

In addition to minimizing travel, here are some of the umpire constraints.

In addition to the music machines the house itself features secret doors, an underground cave and a variety of unique features.

And in addition to social models and new gadgets, creative techies are focusing on how to make our lives greener and healthier.

Another aspect of the tertiary structure of the protein is addition of small molecules to the chain.

It is to test the belief that humans are destined to live in other places in addition to earth.

Give this breakfast staple a makeover with the addition of freshly toasted, aromatic hazelnuts.

Yet this extraordinary molecule has other uses in addition to those of biochemistry.

Pasta and chicken get a burst of color and flavor from the addition of in-season greens.

In addition to triggering life-threatening cardiovascular episodes, cocaine can be deadly in another way.

This, in addition to their natural lankiness and size, makes them difficult to place in garden.

Shiso makes an attractive addition to summer borders, but various parts of the plant are also edible.

Known for their intense, luscious fragrance, tuberose is a welcome addition to the summer garden.

Quick-grilled ahi is a nice addition to this warm-weather salad.

Each high-quality poster is gorgeous and is sure to be a welcome addition to any room or office.

But the addition of a water lily-filled pond turns the space into a genuine oasis.

The restaurant is a fine addition to the borough's now-sprawling call-for-reservations dining scene.

But in addition the prison was probably the nation's largest site of biomedical experiments on human beings.

In addition to awe and envy, its rise has spawned a rapidly growing list of trade quarrels.

Long tongues make eating easier-in addition to fruit, the bats snack on pollen and flowers.

Prized for its fragrance, nicotiana is a welcome addition to any summer garden.

And, in addition to its high citric-acid content, lime juice has a second attractive feature: it literally grows on trees.

In addition to a startling array of life, bogs harbor mystery and death.

In hues ranging from seafoam to mauve, these dainty, spreading succulents make a fun addition to any garden.

But it's this little hardware addition on the underside of the device that's caught.

Its strong brand makes it a formidable addition to the market.

In addition to carrying-capacity limitations, the physical environment often imposes significant costs on human society.

Indeed, in addition to selecting for wood palatability and.

In addition to exhibit descriptions, docents are on hand to expand on posted descriptions.

The latest addition to the menagerie: teeny-tiny drones that.

Another is the addition of chemicals called sterols to margarines to impede the absorption of cholesterol.

Most landscape plants establish faster when planted in native soils without the addition of amendments.

In addition to this economic benefit, the north gets.

In addition to finding new species, one of the team.

Scientists have long known that in addition to discouraging synapses from.

In addition to significant discoveries about kiwi behavior.

It could be the addition of a streaming-media subscription service to iTunes.

It is a plausible biography-given the necessary addition of animal spirits-but an imaginary one.

In addition to gathering family and communities, they've become a popular tourist attraction.

Addition of polymers to the peptides improves their pharmacological properties.

It's because in addition to its high hardness and density, it has a property called.

The addition to its menu is the biggest diversification ever attempted by the burger giant.

In addition to solving the mirror's weight problem, having many smaller.

The gabled second-floor addition replaces a shallow shed roof.

All of that is in addition to its potential spying capacity.

In addition to milk and cheese, the reindeer provide transportation for.

In addition to confirming the wisdom of these recent decisions, the study could also influence future public health policy.

More useful is the addition of public transport information, seen in the picture at the top of the post.

This, in addition to their gentle nature and good climbing ability, makes corn snakes perfect candidates for movie.

Hair extensions can be a beautiful addition to enhance one's appearance.

The addition of a second blade necessitated extra space for the spring, which also opened up more room for other tools.

In addition to mushrooms, a variety of marine animals as well as select species of.

In addition to audible squeaks, mice produce ultrasonic noises-squeaks so high that humans cannot hear them.

In addition to controlling insects, bacterial diseases, and.

In addition to making existing synapses more robust, learning causes the brain to grow larger.

With a window seat stretching along one side, and a built-in computer desk edging another, this pop-out kitchen addition becomes.

In addition to promoting inflammation and inhibiting coagulation, the molecular hodge-podge that is bee.

In addition to the metal shipping container that once.

In addition to being immune-deficient, the mice also carried a genetic defect that leads to production of a liver toxin.

Thanks to its indoor-outdoor connection and wealth of amenities, the courtyard has become a much-used addition to the home.

The addition of weight below and behind the center of gravity reduces those ill effects by offsetting the baby's load.

Rich, brown butter infused with the flavor of hazelnuts makes a decadent but easy addition to mashed potatoes.

Originally, he meant to build a research practice in addition to caring for patients.

The addition of the simplest pod, berry, or leaf can transform.

In addition to color control, many of the squid can produce light and control its intensity.

Rich, brown butter infused with the flavor of hazelnuts makes a decadent, but easy addition to mashed potatoes.

In addition to fertilizers, the other primary culprit is the consumption of fossil fuels.

With the addition of a few precut items from the grocery.

The price of liberty is, in addition to eternal vigilance, eternal patience with the vacuous blather.

The simple addition of caramelized apples and salty blue cheese gives this tasty soup a sophisticated feel.

Some authors send us an outline in addition to their letter but that is generally not required.

That's the lesson one couple learned when they made a small addition to the cramped galley kitchen.

However, it would be greatly improved with the addition of a few photos.

In addition to pruning, reduce crop by spraying with fruit-control hormones when tiny white flowers appear.

In addition to the recipe ingredients, you'll need the following.

Dandelion greens are quite bitter, so the addition of creamy pine nuts and sweet currants is a great balance.

COLLAPSE

Collins

World English Dictionary

addition (əˈdɪʃən)

—n
1.	the act, process, or result of adding
2.	a person or thing that is added or acquired
3.	a mathematical operation in which the sum of two numbers or quantities is calculated. Usually indicated by the symbol +
4.	chiefly (US), (Canadian) a part added to a building or piece of land; annexe
5.	obsolete a title following a person's name
6.	(adverb) in addition also; as well; besides
7.	(preposition) in addition to besides; as well as

[C15: from Latin additiōn-, from addere to add]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline

Word Origin & History

addition

mid-14c., "that which is added," from O.Fr. addition (13c.), from L. additionem (nom. additio) "an adding to, addition," from additus, pp. of addere (see add). Meaning "action of adding" first attested mid-15c. Phrase in addition to "also" is from 1902. Related: Additional (1640s).

American Heritage

Science Dictionary

addition

(ə-dĭsh'ən) Pronunciation Key
The act, process, or operation of adding two or more numbers to compute their sum.

American Heritage

Idioms & Phrases

addition

see in addition.

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