matter

noun:physical substance in general, as distinct from mind and spirit; (in physics) that which occupies space and possesses rest mass
- The entire universe is composed of matter and energy.
noun:a subject or situation under consideration
- We have several important matters to discuss at the meeting.
noun:a problem, issue, or affair
- What's the matter? You look upset.
noun:written or printed material
- The library has a vast collection of reading matter.
verb:to be of importance; to signify
- It doesn't matter if we are a few minutes late.