1Zoology. Designating or relating to an animal which breeds only once in its lifetime.

2Botany. Of an inflorescence (especially a synflorescence): having the main axis and all of the lateral axes terminating in a single flower.

3Cell Biology. Designating or exhibiting attachment of only one of the sister kinetochores (centromeres) of a mitotic or meiotic chromosome to a pole of the spindle.