Century Dictionary and Cyclopedia - Of or pertaining to one of
several persons-popes and others-named Gregory; especially,
pertaining to Pope Gregory I., the Great (a. d. 590–604), or to
Pope Gregory XIII. (1572–85). - n. One of a club or brotherhood
somewhat similar to the Freemasons, which existed in England in
the early part of the eighteenth century. See Gormogon. - n. A
kind of wig worn in the seventeenth century: so named, it is
said, from the inventor, one Gregory, a barber in the Strand,
London. - n. In music, a melody written in one of the church
modes; a piece of plainsong. GNU Webster's 1913 - adj.
Pertaining to, or originated by, some person named Gregory,
especially one of the popes of that name. - adj. of or relating
to Pope Gregory I or to the plainsong chants of the Roman
Catholic Church - adj. of or relating to Pope Gregory XIII or
the calendar he introduced in 1582 “One would also have to
suppose that "gregorian" is supposed to mean the mass of 1962
guaranteed by the Holy Father to the faith