eighteen

noun

a cardinal number, ten plus eight.

a symbol for this number, as 18 or XVIII.

a set of this many persons or things.

adjective

amounting to 18 in number.

Origin:
before 1000; Middle English ehtetene, Old English eahtatēne; cognate with Old Norse āttjān, German achtzehn. See eight, -teen

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Eighteen is always a great word to know.

So is flibbertigibbet. Does it mean:

a chattering or flighty, light-headed person.

a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.

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Collins

World English Dictionary

eighteen (ˈeɪˈtiːn)

—n
1.	See also number the cardinal number that is the sum of ten and eight and the product of two and nine
2.	a numeral, 18, XVIII, etc, representing this number
3.	the amount or quantity that is eight more than ten
4.	something represented by, representing, or consisting of 18 units
5.	(functioning as singular or plural) a team of 18 players in Australian Rules football

—*determiner*
6.	a. amounting to eighteen: eighteen weeks
	b. (as pronoun): eighteen of them knew

[Old English eahtatēne; related to Old Norse attjan, Old High German ahtozehan]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline

Word Origin & History

eighteen

O.E. eahtatene, eahtatyne; see eight + -teen.

Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences

The germ theory of disease dates to the mid-eighteen-hundreds.

Here, in spite of eighteen missing stanzas, the story is admirably told.

Eighteen months under siege had already drained hospitals of medicine and

working equipment.

He also purchased from his own deeply skeptical party eighteen months of

political forbearance.