n. The act or fact of observing, and noting or fixing in the mind; a seeing and noting; notice: as, a fact that does not come under one's observation.n. The habit or power of observing and noting: as, a man of great observation.n. An act of scientific observing; an accurate remarking (often with measurement) of a fact directly presented to the senses, together with the conditions under which it is presented: as, a meridian observation, made by a navigator, in which he measures the sun's altitude when on the meridian for the purpose of calculating the latitude; the meteorological observations made by the Signal Service Bureau.n. The result of such a scientific practice; the information gained by observing: as, to tabulate observations.n. Knowledge; experience.n. A remark, especially a remark based or professing to be based on what has been observed; an opinion expressed.n. The fact of being seen or noticed; notice; remark: as, to escape observation; anxious to avoid observation.n. Observance; careful attention to rule, custom, or precept, and performance of whatever is prescribed or required.n. A rite; a ceremony; an observance.n. Synonyms Observance, Observation. See observance.n. Experiment, etc. See experience.n. Note, Comment, etc. (see remark, n.), annotation.