when is an argument not an argument?

according to a dictionary entry an argument is the simple act of people disagreeing with each on any issue whatsoever. i thought different. still do kinda. for me an argument was raised voices, or icily cold ones and none of the people concerned backing down and basically a negativistic kind of air developing around the entire situation.
had a ‘argument’ last nite with a friend of mine and i was steamed up but i was enjoying the sparring immensely.
so if you enjoy it, can it still be an argument?
mebbe i should just ape an interesting person i met sometime back and throw away the conventional dictionary and make up one of my very own, with my fundas.wot say you people?