In the Dungeons & Dragons fantasy role-playing game, aberration is a type of creature, or "creature type". Aberrations generally all have bizarre anatomies, strange abilities, alien mindsets, or any combination thereof.
In 3rd edition Dungeons & Dragons, all aberrations have darkvision out to 60 feet. As a group, they have no other special abilities or immunities.
In Dungeons & Dragons 4th edition, Aberration was replaced with the Aberrant creature origin.