seriatim [ˌsɪəriˈeɪtɪm] adv.
1.) One after another, one by one in succession.
seriatim [ˌsɪəriˈeɪtɪm] a.
1.) Following one after the other. rare. (Oxford English Dictionary 2nd Edition)
Etymology: Medieval Latin seriatim, from Latin series, series.
"To all of which flattering expressions, Mr and Mrs Kenwigs replied, by thanking every lady and gentleman, seriatim, for the favour of their company, and hoping they might have enjoyed themselves only half as well as they said they had" (Nicholas Nickelby, Charles Dickens, 1839).
(Marter der zehntausend Christen, Albrecht Dürer, 1508)