Used other than figuratively or idiomatically: see extra, service. / (Philippines, slang) A happy ending (a handjob, especially one provided by a masseuse to a client after a massage).

(evolutionary theory, geology) Synonym of mass extinction

(chiefly science fiction) Synonym of mass extinction

extramarital

(algebra, field theory, algebraic geometry) Any pair of fields, denoted L/K, such that K is a subfield of L.

(algebra, field theory) A field extension L/K which is algebraic over K (i.e., is such that every element of L is a root of some (nonzero) polynomial with coefficients in K).

Alternative form of extra time

(algebra, Galois theory) An algebraic extension that is both a normal and a separable extension; equivalently, an algebraic extension E/F such that the fixed field of its automorphism group (Galois group) Aut(E/F) is the base field F.

Alternative form of extratemporality.

(calculus) A differential operator which acts on a differential k-form to yield a differential (k+1)-form, unless the k-form is a pseudoscalar, in which case it yields 0.