self-efficacy

The term is a modern compound, primarily coined within 20th-century psychology. Its first element, "self," is a fundamental Germanic concept for personal identity, traceable to Proto-Indo-European swé ("separate, apart"), which also gives rise to Latin suus ("one's own"). The second element, "efficacy," originates from Latin efficere, a verb meaning "to work out, accomplish," itself from ex- ("out") and facere ("to make, do"). Thus, the literal construction "self-efficacy" logically builds from "one's own power to accomplish or produce effects," perfectly encapsulating the modern psychological concept of an individual's belief in their personal agency and competence.

Structure: self (own) + efficacy (effectiveness) self: From Old English self, seolf, sylf, meaning "one's own person." It functions as a prefix in this compound, indicating reflexivity or reference to the individual. efficacy: From Latin efficacia ("efficacy, efficiency"), from efficax ("effective"), from efficere ("to accomplish, effect"). It functions as the core noun, meaning "power to produce an effect."