observance

Etymology

From Old French observance, from Latin observantia. Equivalent of observe + -ance.

noun

1. The practice of complying with a law, custom, command or rule.
2. The custom of celebrating a holiday or similar occasion.
3. Observation or the act of watching.
4. (religion) A rule governing a religious order, especially in the Roman Catholic church.
5. That which is to be observed.
6. Reverence; homage.