Meaning

noun the period of time during which a regent governs

noun the period from 1811-1820 when the Prince of Wales was regent during George III's periods of insanity

noun the office of a regent

originFrom Middle English regencie (cf. regente), from Medieval Latin regentia, from Latin regēns, present participle of regō. By surface analysis, regent + -cy; compare also + -ency (“abstract-noun suffix”).

Etymology from Wiktionary, CC BY-SA 3.0