(programming) A form of defensive design aiming to ensure the continuing functioning of a piece of software in spite of unforeseeable usage of it.

(medicine, cardiology) A defect in the structure of the heart and great vessels present at birth.

Alternative form of personal defense weapon

plural of personal defense weapon

plural of personal defence weapon

a compact fully-automatic or semi-automatic firearm similar to a submachine gun but firing a rifle round

Alternative form of high definition

A chess opening characterized by the moves 1.d4 Nf6.

(chess) A chess opening characterized by the moves 1.e4 c6, in which the white king's pawn advances two squares and the black king's bishop's pawn advances one square.

A chess opening characterized by the moves 1.e4 e6, in which the white king's pawn advances two squares and the black king's pawn advance one square.