from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A word having the same or nearly the same meaning as another word or other words in a language.
- n. A word or an expression that serves as a figurative or symbolic substitute for another.
- n. Biology A scientific name of an organism or of a taxonomic group that has been superseded by another name at the same rank.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A word or phrase with a meaning that is the same as, or very similar to, another word or phrase.
- n. Any of the formal names for the taxon, including the valid name (i.e. the senior synonym).
- n. Any name for the taxon, usually a validly published, formally accepted one, but often also an unpublished name.
- n. An alternative (often shorter) name defined for an object in a database.
from the GNU version of the Collaborative International Dictionary of English
- n. One of two or more words (commonly words of the same language) which are equivalents of each other; one of two or more words which have very nearly the same signification, and therefore may often be used interchangeably. See under synonymous.
- n. An incorrect or incorrectly applied scientific name, as a new name applied to a species or genus already properly named, or a specific name preoccupied by that of another species of the same genus; -- so used in the system of nomenclature (which see) in which the correct scientific names of certain natural groups (usually genera, species, and subspecies) are regarded as determined by priority.
- n. One of two or more words corresponding in meaning but of different languages; a heteronym.
from The Century Dictionary and Cyclopedia
- n. A word having the same signification as another; one of two or more words which have the same meaning; by extension, a word having nearly the same meaning as another; one of two or more words which in use cover to a considerable extent the same ground: the opposite of antonym.
- n. A word of one language which corresponds in meaning with a word in another language. See heteronym, 2, paronym, 2, and the quotation from Camden under synonymize.
- n. In natural history, a systematic name having the same, or approximately the same, meaning or application as another which has superseded it; a technical name which, by the rules of nomenclature, is not tenable.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. two words that can be interchanged in a context are said to be synonymous relative to that context
Middle English sinonyme, from Old French synonyme, from Latin synōnymum, from Greek sunōnumon, from neuter of sunōnumos, synonymous; see synonymous.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Middle English sinonyme, from Latin synōnymum, from Ancient Greek συνώνυμον (sunōnumon), neuter singular form of συνώνυμος (sunōnumos, "synonymous"), from σύν ("with") + ὄνομα ("name"). (Wiktionary)