1. of or relating to any of the popes named Gregory, especially Gregory I or Gregory XIII.


  1. relating to, associated with, or introduced by any of the popes named Gregory, esp Gregory I or Gregory XIII

literally “pertaining to Gregory,” from Late Latin Gregorianus, from Gregorius (see Gregory). From c.1600 in reference to church music, from Gregory I (pope from 590-600), who traditionally codified it; 1640s in reference to new calendar (introduced 1582) from Pope Gregory XIII.

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