(astronomy, physics) dark matter comprising elementary particles whose composition is as yet unknown, but is presumed to be unlike normal protons, neutrons and electrons etc.

The property of behaving in a matter-of-fact manner.

(physics) matter which has sufficiently high density that the dominant contribution to its pressure arises from the Pauli exclusion principle.

(law) Legally; according to the law.

(adverbial) Actually, in fact.

Within a book, all content preceding the main text or work itself.

Alternative form of no matter how thin you slice it, it's still baloney

(chiefly US) Regardless of how many clever points or fine distinctions one makes, what one is saying is still false or is still nonsense.

The parts of a book that appear after the main portion of the body text, including the afterword, index and bibliography; the end matter.

(physics) A travelling particle considered in terms of its wavelike properties