late 14c., "expound the meaning of, render clear or explicit," from Old French interpreter "explain; translate" (13c.) and directly from Latin interpretari "explain, expound, understand," from interpres "agent, translator," from inter "between" (see inter-) + second element probably from PIE *per- (5) "to traffic in, sell." Related: Interpreted; interpreting.
From late 14c. as "act or process of explaining or interpreting; an explanation; construction placed upon an action." Meaning "dramatic or musical representation" is from 1880.
Proto-Indo-European root meaning "to traffic in, to sell," an extended sense from root *per- (1) "forward, through" via the notion of "to hand over" or "distribute."
It forms all or part of: appraise; appreciate; depreciate; interpret; praise; precious; price; pornography.
It is the hypothetical source of/evidence for its existence is provided by: Sanskrit aprata "without recompense, gratuitously;" Greek porne "prostitute," originally "bought, purchased," pernanai "to sell;" Latin pretium "reward, prize, value, worth;" Lithuanian perku "I buy."