Definitions
from The American Heritage® Dictionary of the English Language, 4th Edition
 adj. Of, relating to, or based on the number eight: an octal number system.
from Wiktionary, Creative Commons Attribution/ShareAlike License
 n. The number system that uses the eight digits 0, 1, 2, 3, 4, 5, 6, 7.
 adj. Concerning numbers expressed in octal or mathematical calculations performed using octal.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
 adj. of or pertaining to a number system having 8 as its base
Etymologies
Sorry, no etymologies found.
Examples

This, written in octal, gives 666  the number of the Beast.

We have not seen that and most of the data converter testing we have done is at Max, what they would call octal site, I have seen some dual, some quad and some octal, but I haven't seen data converters get into strip testing at this point.

Can these people do octal arithmetic and calculate absolute addresses for machine code jump instructions?

Oh, and I've forgotten more cheap octal gags than you whippersnappers will ever know.

Well, the question is: Define the octal number system and give me the decimal equivalent of the octal numbers 05726 and

"The octal system is a number system with eight digits, like the decimal system has ten and the binary system has two."

His teachers  like poor Mr. Cummings, the freshman math teacher of the octal number incident  stopped calling on him, for fear that he'd mock them and their own limitations.

You made a mistake with the second number  12438 isn't an octal number.

Fred Hoyle has ingeniously speculated that, if we had been born with eight digits and therefore become accustomed to octal arithmetic instead of decimal, we might have invented binary arithmetic and hence electronic computers a century earlier than we did since 8 is a power of 2.

Was that resolution pure hex, octal or ordinary digital?
EXTRALIFE – By Scott Johnson  Today’s Comic: Nerd Jokes are Stupid
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