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number line

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.
Also called real line.
Origin
1955-1960
1955-60
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for number-line

number line

noun
1.
an infinite line on which points represent the real numbers
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
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Difficulty index for number line

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Word Value for number

10
14
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