"operating" in the verb sense
1. operate, run
direct or control projects, businesses, etc.
"She is running a relief operation in the Sudan"
2. 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"
3. operate, control
handle and cause to function
"do not operate machinery after imbibing alcohol"
"control the lever"
4. manoeuver, maneuver, manoeuvre, operate
perform a movement in military or naval tactics in order to secure an advantage in attack or defense
5. engage, mesh, lock, operate
keep engaged
"engaged the gears"
6. operate on, operate
perform surgery on
"The doctors operated on the patient but failed to save his life"
"operating" in the adjective sense
1. operating
involved in a kind of operation
"the operating conditions of the oxidation pond"
2. operational, in operation, operating
being in effect or operation
"de facto apartheid is still operational even in the `new' African nations"- Leslie Marmon Silko
"bus service is in operation during the emergency"
"the company had several operating divisions"
Source: WordNet® (An amazing lexical database of English)
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