ceremonial occasion ce·re·mo·nialoccasion uncommon noun 1. a formal event performed on a special occasion “a ceremony commemorating Pearl Harbor” Synonymsceremonyceremonialceremonial occasionobservance Related words Word family observe Broader terms affair Narrower terms circumstancefuneralweddingpageantdedicationopeningcommemorationmilitary ceremony WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.