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1

zero

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noun ze·ro \ˈzē-(ˌ)rō, ˈzir-(ˌ)ō\

Simple Definition of zero

  • : the number 0

  • : the temperature shown by the zero mark on a thermometer

  • : nothing at all

Full Definition of zero

plural zeros also zeroes

  1. 1 a :  the arithmetical symbol 0 or 0̸ denoting the absence of all magnitude or quantity b :  additive identity; specifically :  the number between the set of all negative numbers and the set of all positive numbers c :  a value of an independent variable that makes a function equal to zero <+2 and −2 are zeros of f(x)=x2−4>

  2. 2 — see number table

  3. 3 a (1) :  the point of departure in reckoning; specifically :  the point from which the graduation of a scale (as of a thermometer) begins (2) :  the temperature represented by the zero mark on a thermometer b :  the setting or adjustment of the sights of a firearm that causes it to shoot to point of aim at a desired range

  4. 4 :  an insignificant person or thing :  nonentity

  5. 5 a :  a state of total absence or neutrality b :  the lowest point :  nadir

  6. 6 :  something arbitrarily or conveniently designated zero

Examples of zero

  1. Two minus two equals zero.

  2. It's supposed to fall below zero tonight.

  3. The temperature is 10° above zero.

  4. They are working to reduce the mortality rate to zero.



Origin of zero

French or Italian; French zéro, from Italian zero, from Medieval Latin zephirum, from Arabic ṣifr


First Known Use: 1598

Other Number-Related Terms


2

zero

adjective ze·ro

Simple Definition of zero

  • : not any

Full Definition of zero

  1. 1 a :  of, relating to, or being a zero b :  having no magnitude or quantity :  not any <zero growth> <zero tolerance> c (1) :  having no phonetic manifestation <the zero modification in the past tense of cut> (2) :  having no modified inflectional form <a zero plural>

  2. 2 a of a cloud ceiling :  limiting vision to 50 feet (15 meters) or less b of horizontal visibility :  limited to 165 feet (50.3 meters) or less

1810

First Known Use of zero

1810


3

zero

verb ze·ro

Simple Definition of zero

  • : to set (a measuring device, such as a scale) so that it reads 0

Full Definition of zero

  1. transitive verb
  2. 1 :  to determine or adjust the zero of (as a rifle)

  3. 2 a :  to concentrate firepower on the exact range of —usually used with in b :  to bring to bear on the exact range of a target —usually used with in

  4. intransitive verb
  5. 1 :  to adjust fire on a specific target —usually used with in

  6. 2 :  to close in on or focus attention on an objective —usually used with in <investigators are zeroing in on a suspect>

1913

First Known Use of zero

1913


Medical Dictionary

noun ze·ro \ˈzē-(ˌ)rō, ˈzi(ə)r-(ˌ)ō\

Medical Definition of zero

plural zeros also zeroes

  1. 1:  the arithmetical symbol 0 or 0̸ denoting the absence of all magnitude or quantity

  2. 2a:  the point of departure in reckoning; specifically :  the point from which the graduation of a scale (as of a thermometer) beginsb:  the temperature represented by the zero mark on a thermometer






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