Gregorian

adjective (1)
Gre·​go·​ri·​an | \gri-ˈgȯr-ē-ən \

Definition of Gregorian 

(Entry 1 of 3)

: of or relating to Pope Gregory XIII or the Gregorian calendar

Gregorian

adjective (2)

Definition of Gregorian (Entry 2 of 3)

1 : of or relating to Pope Gregory I

2 : of, relating to, or having the characteristics of Gregorian chant

Gregorian

adjective (3)

Definition of Gregorian (Entry 3 of 3)

: of or relating to the Armenian national church

First Known Use of Gregorian

Adjective (1)

1592, in the meaning defined above

Adjective (2)

1653, in the meaning defined at sense 1

Adjective (3)

1902, in the meaning defined above

History and Etymology for Gregorian

Adjective (3)

St. Gregory the Illuminator †332, apostle of Armenia

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The first known use of Gregorian was in 1592

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