observance
[noun]
Synonyms: honouring, carrying out, compliance, fulfilment, performance

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Antonyms: nonobservance, unobservance

[TahlilGaran] English Synonym Dictionary ▲

ob‧ser‧vance /əbˈzɜːvəns $ -ɜːr-/ noun

1. [uncountable] when someone obeys a law or does something because it is part of a religion, custom, or ceremony
observance of
the observance of a peace agreement
the strict observance of Islam
the Memorial Day observance

2. [countable] something you do as part of a ceremony, especially a religious ceremony:
religious observances

[TahlilGaran] Dictionary of Contemporary English ▲