A measure of the extent to which something is directional (noun)
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Use "directionality" in a sentence
"And she felt that intervals had properties, and that numbers had "directionality" - that the interval between 2 and 1 is not the same as the interval between 1 and 2."
"Under those circumstances evolution will appear to be directional, but the directionality is the result of the operation of the evolutionary algorithm under a particular sort of environmental dynamics."
"While the non-GAAP figures for Cavium were different, the directionality was the same."