tie-in 
noun
1A connection or association: there’s a tie-in to another case I’m working on...
- And in politics there should be a distinction drawn between personal relationships and their professional tie-ins.
- Similarly, the tie-in with South American legends and superstitions attempts to engage with a mythic archetype of monstrous evil, but this too is patchy and unconvincing.
- Another issue raised by the independence/dependence distinction is a possible tie-in between the Great Depression and dependent-managed central banks.
Synonyms
connection, association, link, correlation, correspondence, parallel, tie-up, interrelation, relationship, relation, relatedness, interconnection, interdependence, analogy, similarity
1.1A book, film, or other product produced to take advantage of a related work in another medium: [as modifier]: a tie-in book...
- We will continue to be bombarded with embargoed books, movie tie-ins and well-connected authors.
- Oh, and a tie-in book and various bits of merchandise, so there seems to be an audience for it.
- For high-profile Hollywood films, a tie-in with The History Channel or Discovery has become almost mandatory.
1.2 [as modifier] chiefly North American Denoting sales made conditional on the purchase of an additional item or items from the same supplier.Full-line forcing requires a customer to accept all or part of a supplier's range and denies them the ability to purchase selectively; tie-in sales tie the supply of one product to another....
- It has long been noted that rent controls, or price controls generally, induce tie-in sales to avoid the controlled price.
- This behavior explains how one firm with a head start can use tie-in sales and other behavior to prevent generic complementary products from being developed.