Definitions
1.noun(usually in the plural) A little schoolboy, either in grade or size.
2.nounA class or school for young schoolboys.
3.nounAn outhouse: an outbuilding used as a lavatory.
4.adjectiveLittle, small, secondary in rank or importance.
5.adjectiveInsignificant, trifling, or inconsiderable."a petty fault"
6.adjectiveNarrow-minded, small-minded.
7.adjectiveBegrudging in nature, especially over insignificant matters."That corporation is only slightly pettier than they are greedy, and they are overdue to reap the consequences."