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synonym(sĭn`ənĭm) [Gr.,=having the same name], word having a meaning that is the same as or very similar to the meaning of another word of the same language. Some are alike in some meanings only, as live and dwell. As a language develops, words that once were synonyms tend to become restricted so that eventually they differ in meaning or in usage (e.g., prostitute and strumpet, in which the latter is now confined to literary use). Words taken into English from French and Latin have created many synonyms, e.g., wax (taken from Old English), increase (taken from Old French), and augment (taken from Latin). The classic English synonym collections are George Crabb's Synonymes and P. M. Roget's Thesaurus.
A taxonomic name that is rejected as being incorrectly applied, or incorrect in form, or not representative of a natural genetic grouping.
1. a word or phrase used as another name for something, such as Hellene for a Greek
2. Biology a taxonomic name that has been superseded or rejected