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

(set phrase) A linguistic or conceptual distinction which is of no practical importance or which has no effect on meaning; a perceived difference where there is no actual difference.

(set theory, of two sets A and B) The set that contains exactly those elements belonging to A but not to B; the relative complement of B in A.

(British spelling) Alternative form of horse of a different color

Alternative form of march to the beat of a different drum

Alternative form of march to the beat of a different drum

Almost, nearly, the specified attribute, to the extent that the lack of attainment of the attribute does not matter.

plural of distinction without a difference

Synonym of march to the beat of a different drum

Third-person singular simple present indicative form of dance to a different tune