Solemnity refers to a serious and formal occasion. There are various synonyms for this word that can be used in different contexts. One synonym for solemnity is gravity which refers to the seriousness of a situation. Another synonym for solemnity is somberness which refers to a mood that lacks cheer. Alternatively, the word severity can also be used to refer to the seriousness of a situation. In some cases, solemnity can refer to a sense of grandeur or impressiveness, in which case the words majesty or grandeur may be used. Whatever word is chosen to replace solemnity, it should convey a sense of importance and gravity.