(degree) To a detectable degree, sufficient to be observed. / (manner) In an observable manner. / (modal) Indicates that the proposition can be verified by observation.

plural of observability

(uncountable) The state of being observable / (countable) A measure of the extent to which something is observable

observant; watchful

A member of a Franciscan order that strictly observes the rules of St. Francis.

plural of observancy

Obsolete form of observance.

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.

(transitive) To notice or view, especially carefully or with attention to detail. / (transitive) To follow or obey the custom, practice, or rules (especially of a religion).

(archaic) An observation (remark, comment or judgement).