What does #dy/dx# mean? Precalculus Limits, Motion, and the Tangent Line The Derivative by Definition 1 Answer Wataru Oct 18, 2014 It means the derivative #y# with respect to #x#, so if #y=f(x)# #{dy}/{dx}=y'=f'(x)#. I hope that this was helpful. Answer link Related questions How do I find the derivative of a function at a given point? How do I find the derivative of a fraction? How do derivatives apply to real life? How do derivatives relate to limits? How does a partial derivative differ from an ordinary derivative? How does calculus differ from algebra? How does calculus relate to biology? What is the derivative of #e^x#? What is the derivative of #x#? What is the point of calculus? See all questions in The Derivative by Definition Impact of this question 3326 views around the world You can reuse this answer Creative Commons License