- a word having the same or nearly the same meaning as another word in the same language, as happy, joyful, elated. A dictionary of synonyms and antonyms (or opposites), such as Thesaurus.com, is called a thesaurus.
- a word or expression accepted as another name for something, as Arcadia for pastoral simplicity or Wall Street for U.S. financial markets;metonym.
- one of two or more scientific names applied to a single taxon.
- a word that means the same or nearly the same as another word, such as bucket and pail
- a word or phrase used as another name for something, such as Hellene for a Greek
- a taxonomic name that has been superseded or rejected
