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
The observance of something such as a law or custom is the practice of obeying or following it. Local councils should use their powers to ensure strict observance of laws
{i} act of keeping religious laws; act of keeping the biblical commandments; strictness; ritual, ceremony