Perpetual

a.
  1. Neverceasing; continuing forever or for an unlimited time; unfailing; everlasting; continuous.
    2. Circle of perpetual apparition, or Circle of perpetual occultation .
    See under Circle.
    Perpetual calendar ,
    a calendar so devised that it may be adjusted for any month or year.
    Perpetual curacy (Ch. of Eng.),
    a curacy in which all the tithes are appropriated, and no vicarage is endowed.
    Perpetual motion .
    See under Motion.
    Perpetual screw .
    See Endless screw, under Screw.