An abstraction that does not represent a physical entity.
Related Conceptual System.
Cultural Definition
An understanding retained in the mind, from experience, reasoning and/or 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).
(programming) In generic programming, a description of supported operations on a type, including their syntax and semantics.
Pattern Expression
Conceptual & Physical are types of Abstraction.