For the verb: "to think"

Simple Past: thought
Past Participle: thought

WordReference Random House Learner's Dictionary of American English © 2015
think1 /θɪŋk/USA pronunciation v., thought/θɔt/USA pronunciationthink•ing,n. 
v.  [not: be + ~-ing;
no object]
to have a conscious mind that can reason, remember, and make decisions:Descartes said, "I think, therefore I am,'' meaning that the capacity to think was central to what it means to be human.
[no object] to use one's mind in a reasoning way to make a decision about a given situation:Think carefully before you act. to have a certain thing as the subject of one's thoughts: [no object]I was thinking about college the other day.[+ (that) clause]I was thinking that our college days were the best years of our lives.[used with quotations]"That's odd,'' Alice thought.[+ object]Think nice thoughts and go to sleep. [+ of + object] to call something to one's conscious mind:to think of others less fortunate than we are. to consider a possible action or plan: [no object]thinking about cutting her hair.[+ (that) clause]We think that we'll go back to Ithaca some day. [+ of + object] to invent or conceive of something:to think of a plan. [not: be + ~-ing; ~ + (that) clause] to have a belief or opinion:I think she is funny. to consider a person or thing as indicated: [+ adjective + of + object]I only think well of her.[+ object + adjective]He thought me unkind.[+ object + noun]She thought him a total fool. [+ to + verb] to anticipate or expect:I did not think to call you; I know I should have. think over, to evaluate for possible action: [+ object + over]Think the deal over and call us tomorrow.[+ over + object]Think over her offer. think through or out, to solve by thinking; come up with something by thinking: [+ through/out + object]to think through a problem.[+ object + through/out]to think a problem through. think up, to invent; devise;
come up with: [+ up + object]I couldn't think up a better excuse.[+ object + up]to think something up.

n. [countable] Informal Termsthe act or a period of thinking:First, give it a good think. idiom
    Idiomsthink better of, [+ object] to reconsider:He was all set to yell at her, but then he thought better of it and kept quiet. Idiomsthink fit, [no object] to believe or consider (something) to be proper or appropriate:Do as you think fit; I trust your judgment. Idiomsthink little or nothing of, [+ little/nothing + of + object] to believe (something) to be not worthy of notice;
    belittle or disparage:thinks nothing of bicycling 20 miles.
    Idiomsthink the world of, [+ object] to like or admire greatly:Her father thinks the world of her. Idiomsthink twice, to consider carefully before acting:urged him to think twice about going to Hanoi.

think•er, n. [countable]

Collins Concise English Dictionary © HarperCollins Publishers::

think /θɪŋk/ vb (thinks, thinking, thought)
  1. (tr; may take a clause as object) to consider, judge, or believe: he thinks my ideas impractical
  2. (intransitive) often followed by about: to exercise the mind as in order to make a decision; ponder
  3. (intransitive) to be capable of conscious thought: man is the only animal that thinks
  4. to remember; recollect
  5. (intransitive) followed by of: to make the mental choice (of): think of a number
  6. (may take a clause as object or an infinitive) to expect; suppose
  7. to be considerate or aware enough (to do something): he did not think to thank them
  8. (intransitive) to focus the attention on being: think thin, think big
  9. think twiceto consider carefully before deciding (about something)
  1. informal a careful, open-minded assessment
  2. (modifier) informal characterized by or involving thinkers, thinking, or thought

See also think over, think upEtymology: Old English thencan; related to Old Frisian thenza, Old Saxon thenkian, Old High German denken, Old Norse thekkja, Gothic thagkjan

ˈthinker n

'think' also found in these entries:

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