Plain English Meaning
A practice routine flown by reference to instruments only. The pilot follows a fixed sequence of turns, climbs, descents, and straight legs to build smooth, accurate instrument flying skills.
Full Definition
A standardized instrument flight training maneuver flown at a constant airspeed and altitude, consisting of a sequence of timed straight legs and standard-rate turns arranged in a set geometric pattern. Pattern II is used to develop precise aircraft control, instrument scan, and division of attention by requiring the pilot to maintain , altitude, and while transitioning through climbs, descents, and turns on instruments alone.