(set theory) The set that contains all elements belonging to either of given two sets but not to the both; the relative complement of the intersection in the union of given two sets.

(mathematics) The constant added to each element of an arithmetic progression to obtain the next.

To differentiate similar things.

The difference between one measurement of time and another; the length of a time interval. / The difference in clock time between two or more different time zones.

The amount that a piece in a battery is traversed toward or away from a given piece (usually the base piece) to vary the width of the sheaf.

(idiomatic) To offer an opposing opinion humbly. / (idiomatic) To differ (strongly) in interpretation or opinion.

the difference in potential energy between two points in an electric field; the difference in charge between two points in an electrical circuit; voltage

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

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.

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