Is delivery at 33 weeks considered preterm?

Yes: The definition of "term" gestation is 38-42 weeks, so prior to 38 weeks is considered pre-term, or premature labor.

Yes.: Any delivery before 37 weeks is considered preterm and has significant short and long term consequences. A 33 week delivery is not desirable, but is much better than a 28-32 week delivery, meaning most infant should survive intact.