(logic) if and only if

In billiards, a circumstance in which a fault by another player, such as a scratch, permits the competitor to take the cue ball in hand and place it anywhere on the table.

plural of ball in hand

Third-person singular simple present indicative form of tune in

simple past tense and past participle of tune in

present participle of tune in

Eventually, finally. / After a thorough examination of the situation

(Britain, Ireland) A desktop organizer; inbox, in-basket. / (by extension) The amount of new work yet to be done.

successively, one after the other. / Placed in a straight line.

Alternative form of throw-in