Someone who has attained liberation (nirvana) from uncomtrollably recurring rebirth (samsara).
A practitioner, of the shravaka, pratyekabuddha, or bodhisattva class, who has achieved a true stopping of the emotional obscurations and thus has attained liberation (nirvana). Also called a "liberated being." Some translators render the term as "foe-destroyer."
J Hopkins: Foe Destroyer/Worthy One.