Meaning of NULL in English

NULL

I. ˈnəl adjective

Etymology: Middle French nul, literally, none, not any, from Latin nullus, from ne- not + ullus any (akin to unus one) — more at no , one

1.

a. : having no legal or binding force or validity : of no efficacy : invalid , void — often used in the phrase null and void

b. : capable of being regarded as void : voidable at the option of an injured party

2. : amounting to nothing : nil , nonexistent

the null uselessness of the wireless transmitter that lacks a receiving station — Fred Majdalany

3.

a. : having no value : of no consequence : insignificant

news as null as nothing — Emily Dickinson

b. : lacking distinction, character, or personality

the scene … was pitched in the null , noncommittal surroundings of a rehearsal room — Osbert Sitwell

4.

a. : having no members : empty

the null class

b.

(1) : having the character or value of zero

the null element

(2) : having a zero radius

a null sphere

5. : indicating usually by a zero reading on a scale when current or voltage is zero — used of an instrument

6. : of, being, or relating to zero

the photoelectric current through a load resistor produces a voltage drop that is balanced by a potentiometer, thus giving a null reading for each condition of balance — Journal of Research

7. : relating to the null of a radio receiver

II. noun

( -s )

1.

a. : zero 2a(1)

a null -reading instrument

the various signals can combine so that a substantial null in transmission exists at certain frequencies — B.D.Loughlin

b. : a condition of a radio receiver existing when minimum or zero signal is received and resulting from adjustment of parts (as rotation of the directional antenna or tuning of the circuit)

2. : a meaningless letter or code group introduced to impede cryptanalysis

III. transitive verb

( -ed/-ing/-s )

Etymology: Medieval Latin nullare, from Latin nullus null, adjective

1. : to reduce to nothing : destroy , expunge , obliterate

2. : to make void : annul , nullify

the first election he nulled because its irregularity was glaring — Edmund Burke

election nulled by the courts

IV. noun

( -s )

Etymology: by alteration

: knur

V. noun

( -s )

Etymology: by alteration

: knurl 1 ; especially : a raised convex boss or ornament on a flat surface on a piece of furniture

VI. transitive verb

( -ed/-ing/-s )

Etymology: back-formation from nulling

: knurl

VII. noun

( -s )

Etymology: null (III)

1. : nullo

2. : a game of skat played without a trump suit in which the bidder undertakes to lose every trick

VIII. adjective

1. : having zero as a limit

null sequence

2. of a matrix : having all elements equal to zero

Webster's New International English Dictionary.      Новый международный словарь английского языка Webster.