Definition of "in turn"

in turn

prepositional phrase
1. One after the other; one at a time; in succession; successively.
2. In due order; in proper sequence; in a determined or measured sequence, as a waiting line or queue.
3. In response; in return.
  Quotations
  With great humility, I call upon all Americans to help me keep our nation united in defense of those ideals which have been so eloquently proclaimed by Franklin Roosevelt. I want in turn to assure my fellow Americans and all of those who love peace and liberty throughout the world that I will support and defend those ideals with all my strength and all my heart.
  1945 April 16, Harry S. Truman, 9:21 from the start, in MP72-20 President Roosevelt’s Funeral and Procession; Truman – New President of U.S.‎, Harry S. Truman Presidential Library and Museum, National Archives Identifier: 595162
4. Having a relationship sequentially comparable to one just mentioned; accordingly or similarly, with respect to sequence, precedence, or hierarchy.