ob·ser·vance 
/əbˈzɚvəns/ noun
plural ob·ser·vanc·es /əbˈzɚvəns/ noun 1 [noncount] : the practice of following a custom, rule, law, etc.
▪ Sabbath observance — often + of ▪ strict observance of the law/ban/rule ▪ The office will be closed in observance of the holiday. 2 [count] : an act that is part of a ceremony or ritual
▪ a special holiday observance — usually plural ▪ religious/ritual observances
▪ Sabbath observance — often + of ▪ strict observance of the law/ban/rule ▪ The office will be closed in observance of the holiday.
▪ a special holiday observance — usually plural ▪ religious/ritual observances
