Is "decider" a real word?

[skcin]

I already SAID that I looked it UP and conceded that it IS a word!

I just think it sounds....I don't know....really elementary school playgroundish? Like something I would say - not what a wrold leader should say!

For example: "Shut up, Strand, you can't keep posting definitions here in my thread! WHY? Because I'm the decider!"

"I'm the decider,
I've been burned by this liar
and I've had to live
with his false promises
I want him to retire
I'm the DECIDER!"