idea is on the Basic English 850 List. ice - idea - if idea is one of the 1000 most common headwords. I - idea - identify Pronunciation (UK) IPA (key): /aɪˈdɪə/, SAMPA: /aI"dI@/ (US) IPA (key): /aɪˈdiːə/, SAMPA: /aI"di:@/ Audio (US)(file) Singular idea Plural ideas (countable) An idea is a concept or a thought. Synonyms: concept, thought and conception It was a good idea. (countable) An idea is something abstract (not concrete). Synonyms: abstraction and concept Antonyms: reality and fact Love is just an idea. (countable) An idea is a way to see something, a view. Synonyms: viewpoint, point of view and opinion Antonyms: reality and fact He changed her ideas on religion. Related words ideal ideology ideality ideate ideologue