operate
verb(op-er-ate)
handle and cause to function
Examples:
Do not operate machinery after imbibing alcohol. 
operate
verb(op-er-ate)
perform as expected when applied
operate
verb(op-er-ate)
perform surgery on
Synonyms: operate on, 
Examples:
The doctors operated on the patient but failed to save his life. 
operate
verb(op-er-ate)
direct or control; projects, businesses, etc.
operate
verb(op-er-ate)
perform a movement in military or naval tactics in order to secure an advantage in attack or defense
operate
verb(op-er-ate)
keep engaged