noun
(chiefly uncountable) The act of observing; perception.
(countable) A written or printed announcement.
(countable) A formal notification or warning.
(chiefly uncountable) Advance notification of termination of employment, given by an employer to an employee or vice versa.
(countable) A published critical review of a play or the like.
(uncountable) Prior notification.
(dated) Attention; respectful treatment; civility.
verb
(transitive, now rare) To remark upon; to mention.
(transitive) To become aware of; to observe.
(obsolete, transitive) To lavish attention upon; to treat (someone) favourably.
(intransitive) To be noticeable; to show.