1972 novel by Michael Crichton under pen-name John Lange (6)

I believe the answer is:

binary

(Other definitions for binary that I've seen before include "A system of two stars" , "Double (star)" , "Arithmetic system to the base of 2 as used by computers" , "Composed of two (as with code, star etc)" , "Involving two things" .)

I've seen this clue in The Mirror.

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