Noun

(en noun)

The act of observing, and the fact of being observed.

*

, title=(The Celebrity), chapter=5 , passage=But Miss Thorn relieved the situation by laughing aloud,

* {{quote-magazine, year=2012, month=March-April, author=(Jeremy Bernstein)

, volume=100, issue=2, page=146, magazine=(American Scientist) , title= A Palette of Particles , passage=The physics of elementary particles in the 20th century was distinguished by the observation of particles whose existence had been predicted by theorists sometimes decades earlier.}}

The act of noting and recording some event; or the record of such noting.

A remark or comment.

* Shakespeare

That's a foolish observation .

* Alexander Pope

To observations which ourselves we make / We grow more partial for the observer's sake.

A judgement based on observing.

Performance of what is prescribed; adherence in practice; observance.

* Jeremy Taylor

We are to procure dispensation or leave to omit the observation of it in such circumstances.

Noun

(en noun)

A non-existent or empty value or set of values.

Zero]] quantity of [[expression, expressions; nothing.

(Francis Bacon)

Something that has no force or meaning.

(computing) the ASCII or Unicode character (), represented by a zero value, that indicates no character and is sometimes used as a string terminator.

(computing) the attribute of an entity that has no valid value.

Since no date of birth was entered for the patient, his age is null .

One of the beads in nulled work.

(statistics) null hypothesis