Crossword Genius

Proceeding by eights (5)

Ross

I believe the answer is:

octal

(Other definitions for octal that I've seen before include "Pertaining to a number system with 8 as its base" , "based on eights" , "using smaller base than usual" , "with unusual base" , "Relating to the number 8" .)

I've seen this clue in the Sydney Morning Herald.
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