1. (

• operation ,
• functioning ,
• performance

) 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

) 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 ,

) 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

) perform duties attached to a particular office or place or function; "His wife officiated as his private secretary" ;

1. (

• functioning

) performing or able to perform its regular function; "a functioning flashlight" ;