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The Collaborative International Dictionary
Aliturgical

Aliturgical \Al`i*tur"gic*al\, a. [Pref. a- + liturgical.] (Eccl.) Applied to those days when the holy sacrifice is not offered.
--Shipley. [1913 Webster] ||

Wiktionary
aliturgical

a. (context of a day in the Christian calendar English) On which the holy sacrifice is not offered.