Crossword Genius

Based on eight (5)

Ross

I believe the answer is:

octal

'based on eight' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for octal that I've seen before include "Of a number system with base eight" , "(Of maths) in base eight" , "Working in base 8" , "Relating to the number 8" , "Using 8 as base (maths)" .)

I've seen this clue in the Penny Press.
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