[925] In perpetŭum (lat.), auf immer.
Brockhaus-1809: Perpetuum Mobile · Das Perpetuum mobile
Brockhaus-1837: Perpetuum mobile
Brockhaus-1911: Perpetuum mobile
DamenConvLex-1834: Perpetuum mobile
Herder-1854: Perpetuum mobile
Lueger-1904: Perpetuum mobile
Meyers-1905: Perpetŭum mobĭle · In perpetŭum
Pierer-1857: Perpetŭum mobĭle