A condition in which two or more ova produced at the same time are fertilised by different males.
Fertilization of two or more ova released during the same menstrual cycle by spermatozoa from separate acts of coitus.
The fertilization of two or more ova of the same age by spermatozoa from different males.
Successive fertilization by two or more separate instances of sexual intercourse of two or more ova formed during the same menstrual cycle. Fertilization may be by the same male or by two different males.
The fertilization of multiple egg cells, released more or less simultaneously, through multiple instances of sexual intercourse, which may not necessarily involve the same male partner.