Definitions of brass:

noun: a wind instrument that consists of a brass tube (usually of variable length) blown by means of a cup-shaped or funnel-shaped mouthpiece
noun: a memorial made of brass
noun: an ornament or utensil made of brass
noun: an alloy of copper and zinc
noun: the section of a band or orchestra that plays brass instruments
noun: impudent aggressiveness
noun: the persons (or committees or departments etc.) who make up a body for the purpose of administering something
name: A surname (rare: 1 in 100000 families; popularity rank in the U.S.: #14394)