What is the meaning of Null?

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

Zero quantity of expressions; nothing.

Something that has no force or meaning.

The null character; the ASCII or Unicode character (), represented by a zero value, which indicates no character and is sometimes used as a string terminator.

The attribute of an entity that has no valid value.

One of the beads in nulled work.

The null hypothesis.

Having no validity; "null and void".

Insignificant.

Absent or non-existent.

Of the null set.

Of or comprising a value of precisely zero.

Causing a complete loss of gene function; amorphic.

Neutral.

To nullify; to annul.

To return to the null position, setting, etc.

To form nulls, or into nulls, as in a lathe.

To crack; to remove restrictions or limitations in (software).

zero

zero

no

zero, nought, nil

zero (numeric symbol of zero), nought, nil

a nobody or nonentity

no

zero, nought, nil

zero , nought, nil

a nobody or nonentity

zero

zero

the numeric symbol that represents the cardinal number zero

zero; nil; nought; love (integer number between −1 and 1, denoting no quantity at all)

zero; no

null (having no validity)

zero

Source: wiktionary.org