superfecundation

Fertilization of more than one ovum within a single menstrual cycle by separate acts of coitus, especially by different males.

The fertilization of two ova at the same menstruation by two different acts of coition. This unquestionably occurs in woman.

Fertilization of two ova, at the same menstruation, by two different acts of coition.

the fertilisation of two or more ova by sperm from separate acts of sexual intercourse, which can lead to twins with different fathers

fertilization of two or more ova released during the same menstrual cycle by sperm from separate acts of coitus (especially by different males)