1875, originally a legal term for "authorization to a debtor to postpone due payment," from neuter of Late Latin moratorius "tending to delay," from Latin morari "to delay," from mora "pause, delay," from PIE *morh- "to hinder, delay" (source also of Sanskrit amurchat "to congeal, become solid;" Old Irish maraid "lasts, remains"). The word didn't come out of italics until 1914. General sense of "a postponement, deliberate temporary suspension" is recorded by 1932. Related: Moratorial.
<a href="https://www.etymonline.com/word/moratoria">Etymology of moratoria by etymonline</a>
Harper, D. (n.d.). Etymology of moratoria. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/moratoria