In addition, large-scale climate events like El Nino and La Nina redistribute vast water masses among Earth's ocean, atmosphere and land. Scientists care because, to put movements of Earth's crust into proper context, they need a frame of reference to evaluate them against.
Adj. 1. operant-having influence or producing an effect; many emotional determinants at work; an operant conscience. operative-being in force or having or exerting force; operative regulations; the major tendencies operative in the American political system. 1  Facebook.
exeunt (plural exeunts) 1  A stage direction for more than one actor to leave the stage. 1909, Victor Emanuel Albright, The Shakesperian stage, page 124: undoubtedly the curtains closed at the exeunt of all the characters but one. 2  An act of one or more actors leaving the stage.