adverb
: in due order of succession : successively
new waves of hope arise to shatter themselves in turn against the sands of despair — M.R.Cohen
revision of estimated sales … and this, in turn, will mean revision in production schedules — J.K.Blake
: alternately
in turn caustic and idyllic — Mark Gayn
each in turn comes into the ascendant at the other's expense — A.J.Toynbee