e/Local linearity

Information
has gloss	eng: Local linearity is a property of functions that says — roughly — that if you zoom in on a point on the graph of the function (with equal scaling horizontally and vertically), the graph will eventually look like a straight line. More precisely, a function is locally linear at a point if and only if a tangent line exists at said point.
lexicalization	eng: Local linearity
instance of	e/Smooth function