Used other than figuratively or idiomatically: see open, attack: to begin attacking, to commence battle. / (cricket) Of a bowler: to bowl one of the first two overs.

A UK university offering distance learning taught courses to people without formal academic qualifications, teaching being by correspondence and online with mostly optional tutorials and for some courses compulsory summer schools. Access to postgraduate research is selective and is primarily taught on campus using traditional methods.

The regular times of day when a shop, office or similar is open to the public.

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

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

(Britain, Australia) a can opener.

A device used to open tin cans, usually by slicing the lid off. / (roller derby) A shoulder hit to the chest, usually accomplished while moving from a crouched to a standing position.

An uncovered fire.

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

plural of can-opener