(idiomatic) sequential or consecutive, in the case of exactly three events.

sequential or consecutive. / With one's back facing that of somebody else. / (physics, by extension) emerging in exactly opposite directions / (of a house) Having a party wall at the rear

Alternative form of back to back

A house with a party wall at the rear.

Alternative form of back-to-back

With one's back facing that of somebody else. / Consecutively; one after the other. / (poker slang) Synonym of wired (“being a pair in seven card stud with one face up and one face down”)

plural of back-to-back

(baseball) Two home runs hit by consecutive batters

(telecommunications) The direct connection of the output of one telecommunications device to the input of another.

(travel, UK, Ireland) Any of a series of airline tickets, issued with overlapping travel dates, used to circumvent airfare minimum stay requirements.