concept

noun

1. 1

   An abstract and general idea; an abstraction.

2. 2

   Understanding retained in the mind, from experience, reasoning and imagination; a generalization (generic, basic form), or abstraction (mental impression), of a particular set of instances or occurrences (specific, though different, recorded manifestations of the concept).

3. 3

   In generic programming, a description of supported operations on a type, including their syntax and semantics.