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.

The doctrine, in the Roman Catholic Church, that the Virgin Mary was conceived biologically but free from original sin. / December 8th (The Feast of the Immaculate Conception of Mary).

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

(medicine) The human fetus, placenta and other such by-products of a miscarriage or abortion.

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

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

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".

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

A form of illustration whose main goal is to convey a visual representation of a concept.

Alternative spelling of proof of concept