(of words, equipment, etc.) No longer in use; gone into disuse; disused or neglected (often in favour of something newer). / (biology) Imperfectly developed; not very distinct.

(transitive, US) To cause to become obsolete.

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.

Prone to cause obsession. / Having one thought or pursuing one activity to the absolute or nearly absolute exclusion of all others. / Excessive, as results from obsession.

A person who is obsessed, who has an obsession.

A place where stars, planets and other celestial bodies are observed, usually through a telescope; also place for observing meteorological or other natural phenomena.

A compulsive or irrational preoccupation. / An unhealthy fixation. / Influence or control by evil spirits without possession.

The act of obstructing, or state of being obstructed. / Something which obstructs or impedes, either intentionally or unintentionally

Excessively eager and attentive to please or to obey instructions; fawning, subservient, servile. / (archaic) Obedient; compliant with someone else's orders or wishes.

(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).