(astronomy) A phenomenon that produces an apparent motion of celestial objects about their true positions, dependent on the velocity of the observer.

present participle of hit off

Third-person singular simple present indicative form of hit off

simple past tense and past participle of double off

Third-person singular simple present indicative form of double off

present participle of double off

(baseball, transitive) After a fly ball is caught, to tag the base (a runner) was on at the time of the pitch, thereby causing them to be out for failure to tag up.

(set theory) The axiom that the power set of any set exists and is a valid set, which appears in the standard axiomatisation of set theory, ZFC.

To gain the advantage in a contest.

(poetic) gold