To remove people from a place of danger to a safer location. The authorities decided to evacuate the residents due to the approaching hurricane.
To empty a place or area of its occupants. The building was evacuated after the fire alarm went off.
To withdraw troops or military forces from a place. The army was ordered to evacuate the occupied territory.
To discharge or expel waste matter from the body. The patient was advised to evacuate his bowels before the surgery.