thought

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The process of thinking; cogitation.
• noun A product of thinking or other mental activity: synonym: idea.
• noun The faculty of thinking or reasoning.
• noun The intellectual activity or production of a particular time or group.
• noun Consideration; attention.
• noun Intention; purpose.
• noun Expectation or conception.
• idiom (a thought) To a small degree; somewhat.

from The Century Dictionary.

• noun The act or the product of thinking.
• noun The condition or state of a person during such mental action.
• noun A synonym of cognition in the common threefold division of modes of consciousness: from the fact that thought, as above described, embraces every cognitive process except sensation, which is a mode of consciousness more allied to volition than to other kinds of cognition.
• noun The objective element of the intellectual product.
• noun A judgment or mental proposition, in which form the concept always appears.
• noun An argument, inference, or process of reasoning, by which process the concept is always produced.
• noun A concept, considered as something which, under the influence of experience and mental action, has a development of its own, more or less independent of individual caprices, and that in the life of an individual, and in history: as, the gradual development of Greek thought.
• noun The subjective element of intellectual activity; thinking.
• noun The understanding; intellect.
• noun An intention; a design; a purpose; also, a half-formed determination or expectation with reference to future action: with of: as, I have some thought of going to Europe.
• noun plural A particular frame of mind; a mood or temper.
• noun Doubt; perplexity.
• noun Care; trouble; anxiety; grief.
• noun A slight degree; a fraction; a trifle; a little: used in the adverbial phrase a thought: as, a thought too small.
• noun Preterit of think.
• noun Preterit and past participle of think.
• noun A rower's seat; a thwart.

from the GNU version of the Collaborative International Dictionary of English.

• noun The act of thinking; the exercise of the mind in any of its higher forms; reflection; cogitation.
• noun Meditation; serious consideration.
• noun That which is thought; an idea; a mental conception, whether an opinion, judgment, fancy, purpose, or intention.
• noun Solicitude; anxious care; concern.
• noun colloq. A small degree or quantity; a trifle
• imp. & p. p. of think.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun form created in the mind, rather than the forms perceived through the five senses; an instance of thinking.
• noun uncountable the process by which such forms arise or are manipulated; thinking.
• noun way of thinking (associated with a group, nation or region).
• verb Simple past tense and past participle of think.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the process of using your mind to consider something carefully
• noun the organized beliefs of a period or group or individual
• noun a personal belief or judgment that is not founded on proof or certainty
• noun the content of cognition; the main thing you are thinking about