Definition of "Matter" :
noun: that which has mass and occupies space
"Physicists study both the nature of matter and the forces which govern it."
noun: (used with negation) having consequence
"They were friends and it was no matter who won the games."
noun: a vaguely specified concern
"Several matters to attend to."
noun: a problem
"Is anything the matter?."
noun: some situation or event that is thought about
"It is a matter for the police."
noun: written works (especially in books or magazines)
"He always took some reading matter with him on the plane."
verb: have weight; have import, carry weight
"It does not matter much."