The quality or state of being grippy; the degree to which something can grip, adhere, or provide traction.
From 'grippy' (adjective) plus abstract noun suffix '-ness' (Old English origin). A modern formation to quantify the characteristic of having good grip.
Athletic shoe companies measure grippiness in newtons per square centimeter—it's literally a physics measurement, and high-performance shoes can have 40% more grippiness than casual sneakers, which explains their price difference!
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