(calculus) A differential equation that involves the partial derivatives of a function of several variables.

(calculus) an equation involving the derivatives of a function

(physics) The interference process which occurs when neutrons are scattered by the atoms within solids, liquids and gases.

A type of puzzle in which the object is to find a certain number of minor differences between two pictures, usually printed side by side, that are otherwise identical.

(algebra) The identity x²-y²=(x+y)(x-y), that holds for all real numbers.

(idiomatic) A distinction which makes no difference; a distinction which does not matter.

(computing, historical) A mechanical special-purpose computer used to generate tables of values of polynomials.

(physics, chemistry) The branch of materials science that studies the temperature dependant properties of materials compared with some reference material.

(physics, chemistry) The application of a thermoanalytic technique involving recording any temperature difference between sample and reference materials that are undergoing identical thermal cycles.

simple past tense and past participle of differ