three-way
adjective [ before noun ]
ukusinvolving three people, groups, systems, directions, etc.:
a three-way battle/bidding war/contest They are in a three-way battle to buy a stake in the Football Club.
The phone has a choice of features such as call-waiting, call forwarding, and three-way calling.
a three-way agreement/alliance/deal It could take months to complete the three-way deal.
a three-way merger/spilt He devised the firm's three-way split into separate mining, hotels, and trading firms.