What is your definition of "RARE?"

[zljones]

I have seen the term "rare" overused especially in ebay listings. I have also been corrected by members when I call a card "rare" they tell me I am wrong, even though I scarcley see it for sale, or at a fair price. So I got to ask, what do you consider rare? Meaning not what cards do you consider rare, I mean what is your criteria for a rare card? How much struggle do need to find a card before you finally call it "rare."
For me if I can't get an item in the condition I desire for a proper price for 2 months or more I consider it quite rare, but I have been barked at for considering something like that rare if I have to wait a couple months.
I am also asking about the rarity of buying something not seeing something, this thread is about how rare it is to buy an item.
Also please do not consider super overpriced BINs or auctions, let's pretend like those do not exist in this discussion, because those are not buyable in my perception. Just as good as not being for sale.