A short and/or incomplete realization of a certain method or idea to demonstrate its feasibility. / (software engineering, perhaps nonstandard) A proof of technology or pilot project.

A description, usually graphical, showing the major participants or components in a system and their interrelationships.

An album of music where the content follows an overall theme or narrative.

A diagram showing the relationships among concepts, with the concepts drawn in boxes that are connected with labelled arrows denoting the relationships between concepts, such as "is a", "gives rise to", "results in", "is required by," or "contributes to".

(poker) The notion that a player should have higher standards to play against someone who has already bet (i.e., the player should play tighter, play fewer hands).

plural of operating concept

(automotive) An automobile which is not available for retail sale and which is usually only a mock-up having limited functionality, but which may be displayed at auto shows to represent design ideas under consideration for future vehicles.

plural of proof of concept

A concept that cannot be defined in terms of other concepts. Also primitive notion

(of a film, book, etc.) An appealing idea for a work that can be understandably summarized in a few sentences or less.