(chess) A variant of the Reti Opening in which white moves its queen's rook pawn to a4 on the third move (1. Nf3 d5 2. a4).

plural of open defecation

(public health) The human practice of defecating outside rather than into a toilet

Of, or pertaining to the outside or outdoors

Of or pertaining to work that is done from home, especially via the Internet.

(astronomy) a more or less irregular star cluster containing tens to thousands of stars

(film) Of a soft matte film, transferred to a home video format with the full frame exposed, thus having the theatrical mattes removed.

(idiomatic) To begin firing (weapons) at something or someone.

An uncovered fire.

Something that is in its beta stage, or being tested.