1. (n.) The act of commemorating; an observance or celebration designed to honor the memory of some person or event.

2. (n.) Whatever serves the purpose of commemorating; a memorial.

anniversaries anniversary annual holiday bicentenary bicentennial biennial birthday bissextile day celebrating celebration centenary centennial ceremony decennial diamond jubilee dressing ship fanfare fanfaronade favor festivity flourish of trumpets golden wedding anniversary holiday holy days immovable feast jubilee keepsake leap year marking the occasion memento memento mori memorabilia memorial memorialization memorials memories memory name day natal day observance octennial ovation quadrennial quasquicentennial quincentenary quincentennial quinquennial rejoicing relic religious rites remembrance remembrancer revel rite ritual observance salute salvo septennial sesquicentennial sextennial silver wedding anniversary solemn observance solemnization souvenir tercentenary tercentennial testimonial testimonial banquet testimonial dinner toast token token of remembrance tribute tricennial triennial triumph trophy wedding anniversary