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

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

(followed by a phrase) Regardless, in spite of. / (not followed by a phrase) Regardless of any or most possible adverse circumstances.

it is not important; do not fret (used to reassure or comfort the person to whom it is said) / I withdraw my previous statement (often used if it wasn't heard or understood).

Alternative spelling of antimatter

(idiomatic) A natural or logical outcome. / (idiomatic) An expected or customary outcome.

(physics) Any form of matter, such as a solid or liquid, in which there are strong interactions between neighbouring atoms

(obsolete) Somewhat; slightly; a little.

Dated spelling of fecal matter.

(idiomatic) An inevitable result; something that is bound to happen.