What is another word for "observance"?

Roget's Thesaurus (1911) lists these synonyms for "observance": abide, acknowledge, acknowledgment, acquiescence, acquit, acquittal, acquittance, act, adhere, adhesion, allegiance, and, answer, attend, bad, bear, beck, bias, bidding, bigotry, box, breach, break, call, carry, cast, cling, come, command, compliance, compliant, comply, concurrence, constancy, control, country, cry, custom, deference, desuetude.