n. 25B6; noun
the celebration of his 50th birthday : COMMEMORATION, observance, marking, keeping.
a cause for celebration : JOLLIFICATION, merrymaking, enjoying oneself, carousing, revelry, revels, festivities; informal partying.
a birthday celebration : PARTY, function, gathering, festivities, festival, fête, carnival, jamboree; informal do, bash, rave; Brit. informal rave-up, knees-up, beanfeast, bunfight, beano.
the celebration of the Eucharist : OBSERVANCE, performance, officiation, solemnization.