1. operation, functioning, performance, process, physical process
usage: process or manner of functioning or operating; "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"
1. function, work, operate, go, run
usage: perform as expected when applied; "The washing machine won't go unless it's plugged in"; "Does this old car still run well?"; "This old radio doesn't work anymore"
2. serve, function, suffice, do, answer, serve
usage: serve a purpose, role, or function; "The tree stump serves as a table"; "The female students served as a control group"; "This table would serve very well"; "His freedom served him well"; "The table functions as a desk"
3. officiate, function, serve
usage: perform duties attached to a particular office or place or function; "His wife officiated as his private secretary"