(dated or US) It doesn't matter, it's unimportant, it doesn't make any difference.

Irrespective of, regardless of, in spite of.

(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).

(idiomatic) as far as that is concerned.

Alternative spelling of antimatter

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

(humorous) Used to assert the opinion that sexual partners prefer men with larger penises, or that penis size has an effect on the quality of an act of intercourse.

An underground storage place for grain.

Without matter, void of matter / unimportant, irrelevant.