1.A thought or collection of thoughts that generate in the mind. An idea is usually generated with intent, but can also be created unintentionally. Ideas often form during brainstorming sessions or through discussions.
2.An impression or notion that tries to portray the overarching scope or outline. "Give me a general idea of how much the project will cost," refers to the fact that the supervisor needs a general estimate of how much the employee believes the project will cost.
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