Synonyms: operation, performance, functioning
Definition: process or manner of functioning or operating
Usage: the power of its engine determines its operation; the plane's operation in high winds; they compared the cooking performance of each oven; the jet's performance conformed to high standards
Similar words: physical process, process
Definition: a sustained phenomenon or one marked by gradual changes through a series of states
Usage: events now in process; the process of calcification begins later for boys than for girls
Synonyms: functioning
Definition: performing or able to perform its regular function
Usage: a functioning flashlight
Similar words: functional, operative, running, working
Definition: (of e.g. a machine) performing or capable of performing
Usage: in running (or working) order; a functional set of brakes
Similar words: up
Definition: (used of computers) operating properly
Usage: how soon will the computers be up?