(Canada, US) At the back.

At that time, at the time referred to in the past.

As a result of; after; subsequent to. / (derogatory) By the effort of; by drawing an unfair advantage from.

Back in its adverbial senses. / Situated, located, or toward the rear; backward or in reverse; in return; again. / (UK, obsolete) False; pseudo-.

(Chester) behind, at the back

A surname.

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

(baseball) Two home runs hit by consecutive batters

plural of back to back jack

plural of back-to-back connection