noun

• 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.
• Performance of what is prescribed; adherence in practice; observance.
• A regime under which a subject is routinely observed.
• Philosophically as: the phenomenal presence of human being existence.
• (stochastics) A realization of a random variable.