['ɔpə'reɪʃ(ə)n] n This HTML5 player is not supported by your browser
comp., MS oibríocht (In mathematics, an action performed on a set of entities that produces a new entity. Examples of mathematical operations are addition and subtraction) lab.law. céim oibre gen. gníomhaíocht English thesaurus abbr., inf. o mil., abbr. op ; oper mil., logist. Organised set of actions carried out, generally, by a joint force, or even an interallied or multinational one, on one or several field s of operations, in order to reach one or several military target s . (FRA) USA A sequence of tactical actions with a common purpose or unifying theme (JP 1) ; A military action or the carrying out of a strategic, operational, tactical, service, training, or administrative military mission (JP 3-0) abbr., railw. oprtns (mouss busin., abbr. o
