Brad here. This new word is best defined with a brief story:
Brad: "So I have a theory about why the....blah...blah...blah.... Well, do you agree with my theory?"
Zander [slightly sarcastic]: "Daddy, you mean your hypothesis."
Brad [trying not to sound too amazed that he knew the difference between a theory and a hypothesis]: "Wow, you're right. Where did you learn that?"
Zander: "The dinosaur website I have been going to."
I was schooled by a 5 year old. I'm so proud!