(transitive) To perform by turns, or in succession; to cause to succeed by turns; to interchange regularly.

(intransitive) To argue, quarrel or wrangle.

Any of various medical methods and practices used in place of, or as well as, conventional medicine.

(physics) An electric current in which the direction of flow of the electrons reverses periodically.

(geometry) the internal angles made by two (parallel) lines with a third, on opposite sides of it.

A voting system in which each voter lists the candidates in order of preference. At each stage the candidate with the fewest votes is excluded and their votes transferred according to the voters' preferences.

(law) The resolution of a dispute through negotiation, mediation, arbitration, or similar means, as opposed to litigation.

present participle of alternate

That alternates. / (mathematics, of a knot) Having a planar diagram whose crossings alternate between "over" and "under" as one travels along the knot.

Somebody's alternate personality or persona; another self. / A very close and intimate friend.