Physical substance in general, as distinct from mind and spirit; that which occupies space and possesses rest mass, especially as distinct from energy.

The scientist explained that everything around us is made up of matter.

An affair or situation under consideration; a topic.

The matter of the missing documents was discussed in the meeting.

A substance discharged by a living body, especially pus.

The doctor examined the wound and noted that it was oozing matter.

The subject or content of a book or document.

The matter of the report was thoroughly reviewed by the committee.

A problem or difficulty that causes concern or requires attention.

Is something the matter with the engine?

A legal case, proceeding, or issue to be decided or addressed.

The judge postponed the matter until additional evidence could be presented.

matterverb

To be of importance or significance.

It doesn't matter what others think as long as you are happy.

To produce or discharge pus from a wound.

The sore began to matter after a few days.