Aristotelian: undeveloped potentiality subject to change and development; formlessness. Matter receives form, and becomes substance.
Matter made up of normal particles, not antiparticles.
An affair, condition, or subject, especially one of concern or (especially when preceded by the) one that is problematic.
The basic structural component of the universe, usually having mass and volume.
An approximate amount or extent.
Printed material, especially in books or magazines.
A kind of substance.
To be important.
To care about, to mind; to find important.
The state of being actual or real; realness.
The entirety of all that is real.
The real world.
An individual observer's own subjective perception of that which is real.
A real entity, event, or other fact.