(obsolete, gay slang) Taking or preferring to take the insertive role in anal sex.

(obsolete, gay slang) Preferring to give rather than receive fellatio.

A method of learning in which students actively take part in devising the learning process.

plural of active voice

A line of eclectic social science theories and research with its roots in a Soviet theory pioneered by Sergei Rubinstein in the 1930s, seeking to understand human activities as systemic and socially situated phenomena and to go beyond paradigms of reflexology and classical conditioning.

plural of displacement activity

an activity started by the citizens themselves; social movement

plural of activity tracker

A wearable electronic device, or a software application, that monitors and tracks fitness-related metrics such as distance walked, calorie consumption, or heartbeat.

(physics) The differential Raman scattering of left and right circularly polarized light by chiral molecules.