(informal, computing) A programmer who works only on open source programs.

(clothing) Open at the neck.

(military) A military unit formed up so as to allow space between its ranks. / (nautical) A naval formation in which ships are four cables'-length (2880 feet) apart.

plural of open tuning

(music) A tuning of a guitar or other stringed instrument in which the strings sound a chord when strummed together without being pressed against the fretboard.

(mechanics) A type of differential gear used in automobile construction, allowing for output shafts to have different angular velocity, while equalizing torque applied to each output shaft.

(Australia) Freedom to act without repercussions; free rein.

(UK) A system of bus operation where passengers may enter through various doors along the vehicle's length without having to pass the driver to buy or show a ticket.

plural of re-opening

Alternative form of reopening