"observance" in the noun sense
1. observation, observance, watching
the act of observing taking a patient look
2. ceremony, ceremonial, ceremonial occasion, observance
a formal event performed on a special occasion
"a ceremony commemorating Pearl Harbor"
3. notice, observation, observance
the act of noticing or paying attention
"he escaped the notice of the police"
4. honoring, observance
conformity with law or custom or practice etc.
Source: WordNet® (An amazing lexical database of English)
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