Extraordinary....hmmmmmmmmm, why if it's EXTRA ordinary wouldn't it be even more ordinary than just ordinary?

So... if I order an 'extra small coffee', should I get a tiny coffee, a big coffee, or one more coffee than I need?

No, it's not "extra" as in "more than." More than ordinary would be "of extreme ordinariness", as Kittypal says. Same with "extra full." It's "extra" as in "outside of", just as "extramarital" means outside of marriage.

Thank you for the great answer Catty!!!!

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Originally posted by kittypal:
Extraordinary....hmmmmmmmmm, why if it's EXTRA ordinary wouldn't it be even more ordinary than just ordinary?

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To strike a pedantic note, in Latin the prefix "extra" means "out of", as in extra-terrestrial, (from) out of the earth. So extraordinary means out of the ordinary.

The meaning you are using came from the meaning of out of the normal quantity - a crate plus one extra, a bakers dozen plus one ectra. From that, people made it into an intensifier - extra small is out of the normal run of smallness. So, as yopu say, in extraordinary, it has almost turned full circle.