'trade-in' definitions:

Definition of 'trade-in'

(from WordNet)
noun
An item of property that is given in part payment for a new one

Definition of 'trade-in'

From: GCIDE
  • trade-in \trade-in\ n.
  • 1. an item of property, such as an automobile, that is given in part payment for a new one. [WordNet 1.5]