An alternative form relating to Cluny or the Cluniac monastic movement; of or pertaining to the abbey and its reforms.
From Cluny plus -isian (a variant Latinate suffix). This is a less common English form, appearing primarily in older ecclesiastical or historical texts. It represents one of several attempts to create an English adjective from the French place name Cluny.
Medieval and Renaissance scholars loved creating variations on the same root word using different Latinate suffixes—Cluniac, Cluniacensian, Clunisian—each one sounding slightly more formal than the last. This wasn't redundancy but precision; different contexts and audiences expected different register levels, much like modern formal vs. casual speech.
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