An instance of listening.

“Give the motor a listen and tell me if it sounds off.”

To pay attention to a sound or speech.

“Please listen carefully as I explain.  I like to listen to music.”

To expect or wait for a sound, such as a signal.

“You should listen for the starting gun.”

To accept advice or obey instruction; to agree or assent.

“Listen, the only reason I yelled at you was because I was upset, OK?  Good children listen to their parents.”