Definition · Plain-language
Synonym
A synonym is a word that has the same or nearly the same meaning as another word, such as big and large, or happy and joyful.
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Words of similar meaning
The word synonym comes from Greek roots meaning "same name". Synonyms give a language richness and flexibility, offering several ways to express a similar idea: small, little, tiny and minute all describe a lack of size. A thesaurus is the reference work that groups synonyms together. Synonyms let writers avoid repetition, fine-tune tone and match their register to an audience. They also help define words, since one common way to explain a term is to offer a more familiar synonym. The opposite relationship — words of contrary meaning — is captured by antonyms.
True synonyms are rare
Perfect synonyms, interchangeable in every context, are uncommon. Most so-called synonyms differ in connotation, formality, region or collocation. Slim, slender, thin and skinny share a denotation but carry different emotional charges, from flattering to unkind. Begin and commence mean the same thing, yet commence is more formal. Big crowd and large crowd are both fine, but you say "big sister", not "large sister". Because of these shades, choosing among synonyms is a matter of nuance, not mere substitution — which is why a thesaurus is a starting point, not a licence to swap words freely.
Using synonyms well
Good writing uses synonyms to add variety and precision, but overusing a thesaurus can backfire — reaching for an unusual synonym to avoid repetition often produces stilted or inaccurate prose, sometimes called "thesaurus abuse". The safer approach is to choose the word that most exactly fits the meaning and tone, even if it repeats. In academic and standards-based writing, consistency of terminology is often valued over variety: using the same term for the same concept prevents confusion, so deliberate repetition can be clearer than an elegant synonym that introduces a subtle shift in meaning.
Key facts
At a glance
- Definition: a word with the same or nearly the same meaning as another
- Origin: Greek syn (together) + onoma (name)
- Opposite of: an antonym (a word of opposite meaning)
- Reference: a thesaurus groups synonyms together
- Note: true, fully interchangeable synonyms are rare
- Differ by: connotation, formality, region and collocation
Common misconceptions
What people often get wrong
Often heard: Synonyms are always perfectly interchangeable.
Actually: Few synonyms are identical in every context. Most differ in connotation, formality or collocation — slim and skinny share a meaning but not a feeling, and you say "big sister", not "large sister".
Often heard: Using more synonyms always makes writing better.
Actually: Overusing a thesaurus can make prose stilted or inaccurate. Often the clearest choice is the exact word, even repeated. Standards-based writing frequently values consistent terminology over variety.
Often heard: A synonym and an antonym are the same kind of thing.
Actually: They are opposites in function. A synonym is a word of similar meaning; an antonym is a word of opposite meaning. Big and large are synonyms; big and small are antonyms.
Going deeper
