I. ˈ ̷ ̷ˌ ̷ ̷ noun
( -s )
Etymology: break in
1. : the act or action of breaking in
2. : a hole in brickwork to receive the end of a timber, a plug, or other member
3. : a preliminary performance or series of performances serving as a trial run
4. : break II 3c
II. adjective
: of or relating to a system or arrangement in which an automatic device permits the transmitting radio operator to receive incoming signals in intervals between his own transmitted signals