definite

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Clearly defined; explicitly precise: synonym: explicit.
• adjective Forthright and unambiguous.
• adjective Clearly developed or firmly decided.
• adjective Readily distinguished or certain.
• adjective Grammar Limiting or particularizing.
• adjective Of a fixed number usually less than 20, as certain floral organs, especially stamens.
• adjective Cymose; determinate.

from The Century Dictionary.

• Having fixed limits; bounded with precision; determinate: as, definite dimensions; definite measure.
• Expressly or precisely prescribed, fixed, or established.
• Having clear limits in signification; determinate; certain precise: as, a definite word, term, or expression.
• Fixed; determinate; exact.
• In grammar, defining; limiting: applied to the article the and its correspondents in other languages.
• In botany: Of a constant number, not exceeding twenty: as, stamens definite.
• Limited in development: as, a definite inflorescence. See centrifugal inflorescence, under centrifugal.
• noun A thing defined.

from the GNU version of the Collaborative International Dictionary of English.

• noun obsolete A thing defined or determined.
• adjective Having certain or distinct; determinate in extent or greatness; limited; fixed
• adjective Having certain limits in signification; determinate; certain; precise; fixed; exact; clear.
• adjective obsolete Determined; resolved.
• adjective Serving to define or restrict; limiting; determining.
• adjective (Gram.) the article the, which is used to designate a particular person or thing, or a particular class of persons or things; -- also called a definitive. See Definitive, n.
• adjective (Bot.) See Determinate inflorescence, under Determinate.
• adjective (Chem.) the essential law of chemical combination that every definite compound always contains the same elements in the same proportions by weight; and, if two or more elements form more than one compound with each other, the relative proportions of each are fixed. Compare Law of multiple proportions, under Multiple.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective Having distinct limits.
• adjective Free from any doubt.
• adjective linguistics Designating an identified or immediately identifiable person or thing.
• noun obsolete Anything that is defined or determined.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• adjective precise; explicit and clearly defined
• adjective known for certain