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A concept is a mental representation encompassing our understanding of a specific category or a specific class of objects or ideas.

The word chair, for example, probably gives us the idea of “something or some object to sit on.” Our generalized mental image of the concept of a chair goes with a four-legged object with a backrest. But, the idea of a “four-legged object to sit on” can provoke us to think of other four-legged objects like “high chair” or “a bar stool”.