A concept is a mental integration of two or more units which are isolated
according to a specific characteristic(s) and united by a specific definition. . . .
[In concept-formation], the uniting involved is not a mere sum, but an
integration, i.e., a blending of the units into a single, new mental
entity which is used thereafter as a single unit of thought (but which can be
broken into its component units whenever required).
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