The quality or state of being bounded by or composed of curved lines; the degree to which something is curved.
From 'curvilinear' plus the abstract noun suffix '-ity'. This nominalization became common in technical writing during the 19th century when precision in describing geometric properties was needed.
Designers measure curvilinearity to quantify how 'organic' a product feels—a smartphone with high curvilinearity feels more natural in your hand than one with sharp edges.
Complete word intelligence in one call. Free tier — 50 lookups/day.