1) a series of events taking place in a regularly repeated order (cycle)

2) a violent whirlpool; a violent or destructive force or series of events (maelstrom)

3) (of) (an example of) a style of writing giving a series of events as a story, as used in novels and poetry (narrative)

4) shaped like a circle or a ball; done with, involving, a circular motion; a (regular) set or series of events (round)