n. In surv., physics, etc., work done, observations taken, or other operations, as triangulation, leveling, observing the stars for latitude, longitude, azimuth, etc., making geological observations, studying objects in their natural state, collecting specimens, etc., carried on in the field or upon the ground, even though indoors.n. Milit., a temporary work thrown up by either besiegers or besieged, or by an army to strengthen a position.