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[hek-suh-des-uh-muh l] /ˌhɛk səˈdɛs ə məl/
1.
Also, hex. of or relating to a numbering system that uses 16 as the radix, employing the numerals 0 through 9 and representing digits greater than 9 with the letters A through F.
2.
relating to or encoded in a hexadecimal system, especially for use by a digital computer.
1955-1960
First recorded in 1955-60; hexa- + decimal
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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/ˌhɛksəˈdɛsɪməl/
1.
relating to or using a number system whose base is 16 rather than 10
noun
2.
a number system having a base 16; the symbols for the numbers 0–9 are the same as those used in the decimal system, and the numbers 10–15 are usually represented by the letters A–F. The system is used as a convenient way of representing the internal binary code of a computer
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for hexadecimal

1954 (adj.); 1970 (n.); from hexa- + decimal.

Online Etymology Dictionary, © 2010 Douglas Harper
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 hexadecimal   (hěk'sə-děs'ə-məl)    Of, relating to, or based on the number 16. ◇ The hexadecimal number system is a way of representing numbers where each successive digit or number represents a multiple of a power of 16. It uses the digits 0-9 plus the letters A, B, C, D, E, F, and G to represent the decimal values 10-15. For example, 4B7E represents (4 × 163) + (11 × 162) + (7 × 161) + (15 × 160), or 19,327 in the decimal system.
The American Heritage® Science Dictionary
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