solemnity

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The quality or condition of being solemn.
• noun A solemn observance or proceeding.

from The Century Dictionary.

• noun A rite or ceremony performed with religious reverence; a ceremonial or festal occasion; ceremony in general; celebration; festivity.
• noun The state or character of being solemn; gravity; impressiveness; solemness: as, the solemnity of his manner; a ceremony of great solemnity.
• noun Affected or mock gravity or seriousness; an aspect of pompous importance.
• noun In law, a solemn nr formal observance; the formality requisite to render an act valid.

from the GNU version of the Collaborative International Dictionary of English.

• noun A rite or ceremony performed with religious reverence; religious or ritual ceremony.
• noun ceremony adapted to impress with awe.
• noun Ceremoniousness; impressiveness; seriousness; grave earnestness; formal dignity; gravity.
• noun Hence, affected gravity or seriousness.
• noun Solemn state or feeling; awe or reverence; also, that which produces such a feeling.
• noun (Law) A solemn or formal observance; proceeding according to due form; the formality which is necessary to render a thing done valid.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The quality of being deeply serious and sober or solemn.
• noun An instance or example of solemn behavior.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a solemn and dignified feeling
• noun a trait of dignified seriousness