Some time ago, Disney changed the term Priority Seating (PS) to Advanced Dining Reservation (ADR), now Disney just uses the term Reservations or Dining Reservations, but the ADR abbreviation is still commonly used here on the DIS.
For a list of common board abbreviations click here: DIS Abbreviations
We were all new once! ADR stands for Advanced Dining Reservation which is a bit misleading since it really isn't a reservation. You show up at your ADR time, and then you are seated at the next available table matching your group size that opens up. There can be long waits at popular places as a result.
There are lots of acronyms, and someone will come along to fill you in with a link, I'm sure.
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