- ceremony, ceremonial, ceremonial occasion, observance - a formal event performed on a special occasion; "a ceremony commemorating Pearl Harbor"
--1 is a kind of affair, occasion, social occasion, function, social function
--1 has particulars: - ceremony - any activity that is performed in an especially solemn elaborate or formal way; "the ceremony of smelling the cork and tasting the wine"; "he makes a ceremony of addressing his golf ball"; "he disposed of it without ceremony"
--2 is a kind of activity
--2 has particulars: tea ceremony, chanoyu- ceremony - the proper or conventional behavior on some solemn occasion; "an inaugural ceremony"
--3 is a kind of activity
--3 has particulars:groundbreaking, groundbreaking ceremony; purification, purgation; lustrum; religious ceremony, religious ritual; military ceremony; presentation - ceremony - the proper or conventional behavior on some solemn occasion; "an inaugural ceremony"