Definition - What does Prior mean?
Prior(s) refers to any past charges that a person may have against them before the current case.
In certain cases, the fact that priors exist will make the given sentence more harsh than if it had been a first-time charge.
Justipedia explains Prior
In cases of crimes like drunk driving, the existence of similar priors can greatly change the sentence and lead to longer incarceration times.
How an Attorney May Prevent Any Charges from Being Filed Against You