A concept is a cognitive unit of meaning... an abstract idea or a mental symbol sometimes also defined as a "unit of knowledge" which is "built" or constructed from other units which act as concept's characteristics. A concept is typically associated with a corresponding representation in a language or semiotic such as a word.

The reasoning and logical processes of the understanding by which concepts are generated as to their existence are...
  • comparison, i.e., the likening of mental images to one another in relation to the unity of our consciousness,
  • reflection, i.e., the going back over different mental images, how they can be comprehended in one's consciousness,
  • abstraction or the segregation of everything else by which the mental images differ.
In order to make our mental images into concepts, we must be able to compare, reflect and abstract (differences and similarities), for these three logical operations of our understanding cycle are essential and are general conditions of generating any concept whatsoever.

For example...
I see a fir, a willow and a linden. In firstly comparing these objects, I notice that they are different from one another in respect of trunk, branches, leaves and the like; further - however - I reflect only on what they have in common, the trunk, the branches, the leaves themselves and abstract from their size, shape, and so forth that they are similar in nature... thus I gradually gain the concept of a tree.

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