Tuesday, May 11, 2010


in biology, similarity of function and superficial resemblance of structures that have different origins. For example, the wings of a fly, a moth, and a bird are analogous because they developed independently as adaptations to a common function-flying. The presence of the analogous structure, in this case the wing, does not reflect evolutionary closeness among the organisms that possess it. Analogy is one aspect of evolutionary biology and is distinct from homology (q.v.), the similarity of structures as a result of similar embryonic origin and development, considered strong evidence of common descent.


a word opposite in meaning to another. Fast is an antonym of slow.Compare synonym

an expression whose meaning is not predictable from the usual meanings of its constituent elements, as kick the bucket or hang one's head, or from the general grammatical rules of a language, as the table round for the round table, and that is not a constituent of a larger expression of like characteristics.


1.absolutely necessary or required; unavoidable: It is imperative that we leave.
2.of the nature of or expressing a command; commanding.
3.Grammar. noting or pertaining to the mood of the verb used in commands, requests, etc., as in Listen! Go!Compare indicative (def. 2), subjunctive (def. 1).
4.a command.
5.something that demands attention or action; an unavoidable obligation or requirement; necessity: It is an imperative that we help defend friendly nations.
a.the imperative mood.
b.a verb in this mood.
7.an obligatory statement, principle, or the like.


1.a word having the same or nearly the same meaning as another in the language, as joyful, elated, glad.
2.a word or expression accepted as another name for something, as Arcadia for pastoral simplicity; metonym.
3.Biology. one of two or more scientific names applied to a single taxon.

Grammar. any member of a class of words that in many languages are distinguished in form, as partly in English by having comparative and superlative endings, or by functioning as modifiers of nouns, as good, wise, perfect.
pertaining to or functioning as an adjective; adjectival: the adjective use of a noun.
not able to stand alone; dependent.
Law. concerning methods of enforcement of legal rights, as pleading and practice (opposed to substantive).
(of dye colors) requiring a mordant or the like to render them permanent (opposed to substantive).

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