As used in this article, the following words have the following meanings:
(a)
“Purchase” means the purchase, loan, or transfer of a firearm.
(b)
“Purchaser” means the purchaser or transferee of a firearm or the person being loaned a firearm.
(c)
“Sale” means the sale, loan, or transfer of a firearm.
(d)
“Seller” means, if the transaction is being conducted pursuant to Chapter 5 (commencing with Section 28050), the person selling, loaning, or transferring the firearm.