definite is on the Academic Word List. definite is one of the 1000 most common headwords. deep - definite - degree Pronunciation (UK) IPA (key): /ˈdɛfɪnɪt/ (US) IPA (key): /ˈdɛfɪnɪt/ or /ˈdɛfənɪt/ Audio (US)(file) Adjective Positive definite Comparative more definite Superlative most definite Someone is definite if they are sure. They have no doubt about what they're saying. She was definite that this is the right place. Something is definite if it has defined limits. An identified person or thing Synonyms unquestionable decided Antonyms indefinite Related words definitely (definite + -ly) definite article definitive definitively indefinite indefinitely This short entry needs someone to make it better. You can help Wiktionary by adding to it.Wikiwand - on Seamless Wikipedia browsing. On steroids.