Ask WoW Insider: When does an alt become a main?

It's time once again for the weekly edition of Ask WoW Insider, wherein we publish a reader question for everyone to answer. This week brings us an esoteric conundrum from Matthew:
I started WoW about 5 months ago and played an Orc Warrior up to lvl 49. When the expansion came out, I started a BE mage and I absolutely love it. However, I have just surpassed my main in level. So now I have a lvl 50 BE mage alt and I don't see myself leveling my warrior for quite awhile. My question is: Is my lvl 49 Orc Warrior still my main if it was overtaken by my lvl 50 Blood Elf Mage alt?
So -- when does an alt become a main, and vice versa?

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This article was originally published on WoW Insider.