Michael Drebes, a 38-year-old Millville resident, was arrested last year after he sexually assaulted the girl and a former female student - who was then 16 - on multiple occasions between February and May 2009.
Authorities learned of the relationship after receiving a tip from a student who knew the younger girl.
Drebes, a math teacher at Memorial High School who taught in the Millville school system for five years, pleaded guilty in January to official misconduct and sexual assault as part of a plea bargain with Cumberland County prosecutors.
Under the sentence imposed Friday, he must serve five years before becoming eligible for parole.
