1. [noun] The formal performance of a solemn rite, such as Christian sacrament
2. [noun] The observance of a holiday or feast day, as by solemnities
3. [noun] The act, process of showing appreciation, gratitude and/or remembrance, notably as a social event.
4. [noun] A social gathering for entertainment and fun; a party.
5. [noun] A joyful occasion for special festivities to mark some happy event.
6. [noun] Any joyous diversion.
7. [noun] The public performance of a sacrament or solemn ceremony with all appropriate ritual; 'the celebration of marriage'.
