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."