A difference between the value of a function evaluated at a number, and the value of the same function evaluated at a different number, a fixed distance from the first.

(idiomatic, intransitive) To carry out an action, the result of which is a significant change, or an altered circumstance. / (idiomatic, intransitive) To be of importance; to matter.

(attributive) spot the difference

(mathematics) An equation involving an ordered sequence of real numbers (a_nₙ₌₁ ᪲) and some of its differences, where the first difference is defined as 𝛥(a_n)=a_n+1-a_n, and the kᵗʰ difference is defined recursively as 𝛥ᵏ(a_n)=𝛥ᵏ⁻¹(a_n+1)-𝛥ᵏ⁻¹(a_n),.

Alternative form of differently able

Used other than figuratively or idiomatically: see what, is, the, difference. / (idiomatic) The difference does not matter; so what?

(physics) mass defect

A disagreement.

(electronics) a logic gate whose output is TRUE when the two inputs are different; a Boolean logic XOR gate.

In a financial transaction, to settle on an amount midway between the offer and the asking price.