Alternative form of alternate universe

(statistics) A rival hypothesis to the null hypothesis. Their likelihoods are compared by a statistical hypothesis test.

Counterfactual history, a form of scientific speculation used by historians.

(topology) A knot that has a knot diagram in which, in traveling along the knot, one passes through intersections alternatingly: over, under, over, under, etc.

(biology) Each of the two forms of an organism whose life cycle involves alternation of generations, or the fact of such alternation occurring in a given organism.

plural of alternating current

plural of alternate generation

(algebra) An algebra such that every subalgebra generated by two elements is associative.

plural of alternative hypothesis

plural of alternating function