(logic) A proof showing that if an assumption A is true then a consequent statement or conclusion B must also be true, i.e. B is true on the condition that A is true.

Capable of surviving changes made in the future; not liable to become outdated.

(transitive) To make ready to meet potential future requirements, or make use of potential future opportunities.

(distilleries) A certain degree of strength in alcoholic liquor, as formerly ascertained by the floating or sinking of glass globules of different specific gravities thrown into it, and later by more accurate meters.

Overproof; containing more alcohol than proof spirit.

(firearms) A charge of powder and ball, greater than the service charge, fired in an arm, as a gun or cannon, to test its strength.

(printing) A page of proofed text; a sheet used to make corrections, emendations etc. before being printed for use. / (photography) A contact print.

plural of proof sheet

(printing, historical) The last proof for correction before sending to press. / (printing, historical) A proof taken on a press, especially to show impression, margins, colour, etc.

plural of proof spirit