What is a multiple gestational pregnancy?

More than one baby. Any pregnancy with more than one baby is a multiple pregnancy. Twins, triplets, etc.
More than 1 baby. Having more than one baby at the same time (twins, triplets, quadruplets.......).
More than 1 baby. A multiple gestation pregnancy is a pregnancy with twins, triplets or in the octomom's case----eight. This is a just a medical term to distinguish between someone pregnant with one baby. That is called a singleton.

Related Questions

What's a multiple gestation pregnancy?

Multifetal pregnancy. Simple answer: a multiple gestation is a pregnancy with more than one fetus. Please see my guide to multiple gestation. I will post the link in comments below. Read more...