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[ok-tl] /ˈɒk tl/
Also, octonary. of or relating to the number system with base 8, employing the numerals 0 through 7.
relating to or encoded in an octal system, especially for use by a digital computer.
(of an electronic device) having eight pins in its base for electrical connections.
octonary (def 6).
Origin of octal
1935-40; oct- + -al1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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octal in Science
Relating to a number system having a base of 8. Each place in an octal number represents a power of 8. Octal notation has often been used in computer programming because three-digit binary numbers are readily converted into one-digit octal numbers from 0 to 7.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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octal in Technology

Base 8. A number representation using the digits 0-7 only, with the right-most digit counting ones, the next counting multiples of 8, then 8^2 = 64, etc. For example, octal 177 is digital 127:
digit weight value 1 8^2 = 64 1* 64 = 64 7 8^1 = 8 7* 8 = 56 7 8^0 = 1 7* 1 = 7 --- 127
Octal system used to be widespread back when many computers used 6-bit bytes, as a 6-bit byte can be conveniently written as a two-digit octal number. Since nowadays a byte is almost always 8-bit long the octal system lost most of its appeal to the hexadecimal system.
For a brief discussion on the word `octal' see hexadecimal.

The Free On-line Dictionary of Computing, © Denis Howe 2010
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