A certainty of a matter. Obsolete. rare.

Fixed, settled, or appointed condition, order, etc.; certainty. Obsolete.

A certainty; a fact. Esp. in for (also of) a surety: for certain. Now somewhat archaic.

A thing proved; a demonstrated conclusion or fact, esp. a means or remedy that has been tried and found effective; an approved remedy. Cf. probatu…

Something experienced, tested, or tried. Obsolete.

As a count noun: a fact or thing certain or sure.

Law. An act performed by a person, a deed, a transaction; (also as a mass noun) doing, execution. Also: a stated or established fact.

figurative phrase matter of breviary (= matiere de breviaire, Rabelais, Pantagruel IV. viii): a thing that admits of no question or doubt.

‘Thing explained or defined’ (Johnson). Obsolete.

concrete. Something fixed.

a settled thing (or matter), used predicatively (often = something about which there is considered to be no room for doubt or question).

A certainty; spec. a horse considered a safe bet to win a race. for a monty: certainly, for sure.