Learner's definition of VENGEANCE
: the act of doing something to hurt someone because that person did something that hurt you or someone else
The fire was set as an act of vengeance.
He swore vengeance [=revenge] against his son's kidnapper.
Angry protesters wanted to inflict vengeance on the killer.
with a vengeance
: with great force or effort
After losing the first three games, the team came back with a vengeance to win the next four.
She set to work with a vengeance and finished the job in two hours.