A type of chess opening, in which White plays 1.e4 (moves their king's pawn to the fourth rank with their first move) and Black breaks symmetry by replying with a move other than 1...e5.

Alternative letter-case form of Semi-Open Game

plural of semi-open game

(mathematics) An interval in the real line which contains one of its endpoints but not the other one: i.e., it either contains its supremum or its infimum but not both.

A system of circulation which is achieved primarily from the heart beating and muscle-induced locomotion of the organism, circulation without veins.

(computing) A communication protocol among computers and multimedia devices, such as sound synthesizers, which is optimized for modern networking technology.

plural of open half space

(idiomatic) To make someone aware of something they did not know or fully understand before; to enlighten someone.

(programming, object-oriented programming) Alternative spelling of open-closed principle

(travel, aviation) A fare construction on a single return ticket where the origin and destination of the first flight are both different from the origin and destination on the return flight.