/trayd"in'/ , n.
1. goods given in whole or, usually, part payment of a purchase: We used our old car as a trade-in for the new one.
2. a business transaction involving a trade-in.
adj.
3. of or pertaining to the valuation of goods used in a trade-in: trade-in price.
4. of or pertaining to such a business transaction: trade-in terms.
[ 1920-25; n., adj. use of v. phrase trade in ]