superfecundation

https://doi.org/10.1351/goldbook.11267

Fertilization of two or more ova released in the same period of ovulation, either by different males or by the same male in separate acts of intercourse.

Note: If there are two or more different fathers, the state may be called heteropaternal superfecundation. Rare in humans, heteropaternal superfecundation is common in some species, such as cats and dogs.
Source:
PAC, 2016, 88, 713. (Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)) on page 809 [Terms] [Paper]