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Precisely defined or explicit.
(adjective)
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Supplying or being a final settlement or decision; conclusive. See Synonyms at decisive.
(adjective)
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Authoritative and complete: a definitive biography. See Usage Note at definite.
(adjective)
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Biology Fully formed or developed, as an organ or structure.
(adjective)
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Grammar A word that defines or limits, such as the definite article or a demonstrative pronoun.
(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.