Learn the meaning, usage and grammar of the verb and noun think in English. Find out how to express opinions, ideas, decisions, problems, memories and more with think and related words and phrases. Think - English Grammar Today - a reference to written and spoken English grammar and usage - Cambridge Dictionary Define think. think synonyms, think pronunciation, think translation, English dictionary definition of think. v. thought , think·ing , thinks v. tr. 1. To have or formulate in the mind: Think the happiest thought you can think. 2. a. To reason about or reflect on;... An educational app loved by 3,000,000 users across 150 countries. Digital learning content that fosters critical thinking skills for children and elementary students (ages 4-10).