1 eternal; lasting for ever or indefinitely.
2 continuous, uninterrupted.
3 colloq. frequent, much repeated (perpetual interruptions).
4 permanent during life (perpetual secretary).
Phrases and idioms:
perpetual calendar a calendar which can be adjusted to show any combination of day, month, and year. perpetual check Chess the position of play when a draw is obtained by repeated checking of the king. perpetual motion the motion of a hypothetical machine which once set in motion would run for ever unless subject to an external force or to wear.
Derivatives:
perpetualism n. perpetually adv.
Etymology: ME f. OF perpetuel f. L perpetualis f. perpetuus f. perpes -etis continuous
Useful english dictionary. 2012.