noun servile attention; sycophancy.
2. observance ·noun an act, ceremony, or rite, as of worship or respect; especially, a customary act or service of attention; a form; a practice; a rite; a custom.
3. observance ·noun the act or practice of observing or noticing with attention; a heeding or keeping with care; performance;
usually with a sense of strictness and fidelity; as, the observance of the sabbath is general; the strict observance of duties.