A measure of the extent to which something is directional(noun)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
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."