solemnity

1 a mental state free of jesting or trifling the coronation ceremony requires absolute solemnity Synonyms earnest, graveness, gravity, intentness, serious-mindedness, seriousness, soberness, sobriety, earnestness, solemnness, staidnessRelated Words gravitas, humorlessness; decisiveness, deliberation, determination, firmness, purposefulness, resoluteness, resolve; absorption, attentiveness, concentration, engrossment, enthrallment, immersion, intensityNear Antonyms lightness, shallowness, superficiality; dalliance, dilettantism; cheerfulness, gaiety (also gayety), glee, high-spiritedness, merriment, mirthAntonyms facetiousness, flightiness, flippancy, frivolity, frivolousness, levity, lightheartedness, lightness, play, unseriousness

2 an oft-repeated action or series of actions performed in accordance with tradition or a set of rules the solemnities of the Easter vigil service Synonyms ceremonial, ceremony, form, formality, observance, ritual, riteRelated Words amenities, civility, decorum, etiquette, graces, proprieties; protocol; convention, custom, habit, manners, mores, practice (also practise), standard, tradition, way; celebration, service