Tasks in progress; involvement in ongoing projects.

(games) A children's game in which two players keep an object away from a third player (who is in between them) by throwing it past that player.

plural of infraorder

(Of a logical fallacy) Deriving from the linguistic expression used; for reason of ambiguity, division, etc.

A theatre in the form of an arena, with seating on at least three of the four sides

(idiomatic) Immediately; instantaneously. / 2007 April 28, Hugh Muir, The Guardian:

Used other than figuratively or idiomatically: see go, in. / (of the sun, moon or stars) To become obscured by clouds. / To share in part of a project's or plan's duties or costs.

(music) A musical instrument that produces sound by means of vibrating strings.

(music) A musical instrument in which sound is produced by blowing against an edge or by vibrating a thin piece of wood or metal known as the reed, and in which the pitch is governed by the resonant frequencies of an enclosed air column.

(law, banking, business) a legal document, as a cheque or bill of exchange, that is freely negotiable.