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number line

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noun Mathematics.
  1. a straight line on which there is indicated a one-to-one correspondence between points on the line and the set of real numbers.
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Origin of number line

First recorded in 1955–60
Also called real line.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for number line

number line

noun
  1. an infinite line on which points represent the real numbers
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012