Definitions of misdemeanour

(COLLOQUIAL) an action that is bad, unacceptable or breaks a rule, but is not a crime

His parents would punish him for even the slightest misdemeanour.

(especially US) a minor crime; a petty offence; a crime that is less serious than a felony

Watson was ordered to pay a fine equivalent to about £31 on the misdemeanour charge.