tie-in • n. a connection or association: there's a tie-in to another case I'm working on. ∎ a book, movie, or other product produced to take advantage of a related work in another medium. ∎ [as adj.] denoting sales made conditional on the purchase of an additional item or items from the same supplier.
"tie-in." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. (January 22, 2019). https://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/tie-2
"tie-in." The Oxford Pocket Dictionary of Current English. . Retrieved January 22, 2019 from Encyclopedia.com: https://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/tie-2