Definition of "Quality" :

noun: an essential and distinguishing attribute of something or someone

"The quality of mercy is not strained."

noun: a degree or grade of excellence or worth

"The quality of students has risen."

noun: (music) the distinctive property of a complex sound (a voice or noise or musical sound)

noun: a characteristic property that defines the apparent individual nature of something

"Each town has a quality all its own."

noun: high social status

"A man of quality."

adjective: of high social status

"People of quality."

adjective: of superior grade

"Quality paper."