Meaning of “discharge” - Learner’s Dictionary

discharge

noun [ C, U ] uk us /ˈdɪstʃɑːdʒ/
LEAVE

the time when someone is officially allowed or ordered to leave somewhere such as a prison, hospital, or the army

COME OUT

a situation in which a liquid or gas comes out of something:

the discharge of carbon dioxide
SUBSTANCE

a liquid or gas that comes out of something

(Definition of “discharge noun” from the Cambridge Learner’s Dictionary © Cambridge University Press)