Alternateness refers to the state or quality of being alternate, which means occurring one after the other in succession. Some synonyms for alternateness include alternation, interchange, rotation, substitution, and vicissitude. Alternation refers to the repeated and orderly succession of events, while interchange denotes the exchange or substitution of things. Rotation and substitution both refer to the replacement of one thing with another, with the former involving a circular movement while the latter may involve a direct replacement. Lastly, vicissitude refers to the natural and inevitable changes or alternations that occur in life. These synonyms can help to express the concept of alternating or changing states in a variety of contexts.