make a counterattack and return like for like, especially evil for evil; "The Empire strikes back"; "The Giants struck back and won the opener"; "The Israeli army retaliated for the Hamas bombing"
any backward region that is isolated from the world and resists progress
a body of water that was created by a flood or tide or by being held or forced back by a dam; "the bayous and backwaters are breeding grounds for mosquitos"
the repetition of an experiment in order to test the validity of its conclusion; "scientists will not believe an experimental result until they have seen at least one replication"
(law) a pleading made by a plaintiff in reply to the defendant's plea or answer
(genetics) the process whereby DNA makes a copy of itself before cell division
a statement acknowledging something or someone; "she must have seen him but she gave no sign of acknowledgment"; "the preface contained an acknowledgment of those who had helped her"