adjective [ usually before noun ]
1.
moving in two different directions; allowing sth to move in two different directions :
two-way traffic
two-way trade
a two-way switch (= that allows electric current to be turned on or off from either of two points)
2.
( of communication between people ) needing equal effort from both people or groups involved :
Friendship is a two-way process.
3.
( of radio equipment, etc. ) used both for sending and receiving signals