an act or instance of modifying.
the state of being modified; partial alteration.
a modified form; variety.
Biology. a change in a living organism acquired from its own activity or environment and not transmitted to its descendants.
limitation or qualification.
the use of a modifier in a construction, or of modifiers in a class of constructions or in a language.
the meaning of a modifier, especially as it affects the meaning of the word or other form modified: Limitation is one kind of modification.
a change in the phonological shape of a morpheme, word, or other form when it functions as an element in a construction, as the change of not to -n't in doesn't.
an adjustment in the form of a word as it passes from one language to another.

1495–1505; < Latin modificātiōn- (stem of modificātiō), equivalent to modificāt(us) (past participle of modificāre; see modify) + -iōn- -ion

intermodification, noun
overmodification, noun
premodification, noun
remodification, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
modification (ˌmɒdɪfɪˈkeɪʃən)
1.  the act of modifying or the condition of being modified
2.  something modified; the result of a modification
3.  a small change or adjustment
4.  grammar the relation between a modifier and the word or phrase that it modifies

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

c.1500, in philosophy, from Fr. modification (14c.) or directly from L. modificationem, noun of action from modificare (see modify). Meaning to alter an object to bring it up to date is from 1774. Biological sense is attested by 1896.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

modification mod·i·fi·ca·tion (mŏd'ə-fĭ-kā'shən)
Any of the changes in an organism that are caused by environment or activity and are not genetically transmissable to offspring.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
modification   (mŏd'ə-fĭ-kā'shən)  Pronunciation Key 
A change in an organism that results from external influences and cannot be inherited.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Certain requirements are subject to possible modification to reasonably
  accommodate individuals with disabilities.
Hitherto, genetic modification has been the work of apprentices and journeymen.
Vegetable plants can be modified in the field through crossbreeding and in the
  lab using genetic modification.
What is important is that genetic modification is not one thing.
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