Толковый словарь английского языка - alternate

I. adjective Etymology: Latin alternatus, past participle of alternare, from alternus ~, from alter Date: 1513 occurring or succeeding by turns , 2. arranged first on one side and then on the other at different levels or points along an axial line , arranged one above or alongside the other, every other ; every second , constituting an alternative , alternative 3, ~ly adverb II. verb (-nated; -nating) Date: 1599 transitive verb to perform by turns or in succession, to cause to ~, intransitive verb to change from one to another repeatedly , III. noun Date: 1717 alternative, one that substitutes for or ~s with another