Able to be observed. / Deserving to be observed; worth regarding; remarkable.

(physics) Any physical property that can be observed and measured directly and not derived from other properties

plural of observable

observability

The act of observing, and the fact of being observed (see observance) / The act of noting and recording some event; or the record of such noting. / A remark or comment. / A judgement based on observing.

The practice of complying with a law, custom, command or rule. / The custom of celebrating a holiday or similar occasion. / Observation or the act of watching.

Alert and paying close attention; watchful. / Diligently attentive in observing a law, custom, duty or principle; regardful; mindful.

One who makes observations, monitors or takes notice / One who adheres or follows laws, guidelines, etc.

plural of observator

plural of observance