Crossword Genius

Dimension, e.g. (4)

Ross

I believe the answer is:

spec

(Other definitions for spec that I've seen before include "Description of requirements" , "On - means without a plan but with hope of success" , "on which chance is taken" , "Estimate" , "Detailed design document (abbr.)" .)

I've seen this clue in The New York Times.
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