say it: uhb-ZUR-vuhns
observance is a noun meaning "the act of observing; taking a patient look". It carries 4 recorded senses.
the act of observing; taking a patient look
a formal event performed on a special occasion
“a ceremony commemorating Pearl Harbor”
the act of noticing or paying attention
“he escaped the notice of the police”
conformity with law or custom or practice etc.
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for observance come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.