Solemnity (noun)

1. A feeling or atmosphere of great seriousness, respect, or gravity.
2. A formal religious or ceremonial occasion marked by dignity and reverence.

Origin:

Late middle english: from old french solennité, from latin sollemnitas, from sollemnis 'observant of religious duties'.

Examples:

1. The courtroom was filled with an air of solemnity as the judge entered.
2. The church was filled with solemnity as the choir sang a requiem.
3. The solemnity of the occasion was palpable as the flag was raised.
4. The solemnity of the ceremony was offset by the beauty of the music.
5. The solemnity of the event was disrupted by a sudden burst of applause.