Solemnity is a noun that refers to a formal observance.
The Latin word sollemnitas (so LEM knee tass) means ‘festival.’ Our word of the day can be used to refer to the state or quality of being serious or dignified or it may refer to a dignified rite or ceremony. Here’s an example of the latter:
In my first week in Spain we attended a lovely solemnity held in a cathedral. Those kinds of observances are a stunning sight to see.
