observance

noun

1.
the act of observing; taking a patient look
onlook observation watching
Derived from:
observe
2.
a formal event performed on a special occasion
ceremonial ceremonial occasion ceremony
Derived from:
observe
3.
the act of noticing or paying attention
bemarking notice observation
Derived from:
observant observe
4.
conformity with law or custom or practice etc.
honoring honouring
Antonym:
nonobservance
Derived from:
observant observe