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1.
An elementary particle similar to an electron, except that it has a positive charge instead of a negative charge. It is an antiparticle, which is a particle that forms antimatter.
When a positron comes into contact with an electron, they annihilate each other, releasing energy.
Look, I got a jar of positrons! I think I'll open it.

No, you fool!!

(KABLOOOMM!!!!)
by bob882 July 06, 2004
 
2.
Being completely sure. Positive.
Did you hide the bong?

Yea dude, in the garage.

Are you absolutely Positron?
by Sir.neilium February 04, 2008