n. Attention; perception; heed; observation.n. Respectful regard or attention; hence, reverence; homage.n. The act of observing, paying attention to, or following in practice; compliance in practice with the requirements of some law, custom, rule, or injunction; due performance: as, the observance of the sabbath; observance of stipulations; observance of prescribed forms.n. A custom, rule, or thing to be observed, followed, or kept.n. A rite or ceremony; an act performed in token of worship, devotion, or respect.n. Synonyms Observance, Observation. These words start from two different senses of the same root — to pay regard to, and to watch. Observation is watching or notice; observance is keeping, conforming to, or complying with. Observation was formerly used in the sense of observance: as, “the observation of the Sabbath is again commanded” (caption to Ex. xxxi.); “the opinions which he [Milton] has expressed respecting … the observation of the Sabbath might, we think, have caused more just surprise” (Macaulay, Milton); but this use is now obsolescent. It is desirable that the words should be kept distinct.n. Form, Rite, etc. See ceremony.