Derivative of "another" usually used when someone says "that's
a whole nother issue" or something along those lines. The correct way to say it is "a whole other issue". "Another" translates to "an other", but people mistakenly believe it translates to "a nother". When you put a word like "whole" in-between "an other" the "an" changes to an "a" because "whole" starts with a consonant instead of a vowel.