Definition of "perpetual"

"And yet," returned Francesca, "the secret of Arden's sufferings seems to have been in himself. From earliest youth he indulged in vain contrasts and repinings, and even his very love was selfish and cruel. Think how much happiness he lost by his perpetual exaggerations!"

1834, L[etitia] E[lizabeth] L[andon], chapter XXVIII, in Francesca Carrara. […], volume II, London: Richard Bentley, […], (successor to Henry Colburn), page 297

There are perpetual requests for changes as new payloads and new demands and modifications are suggested by the users.

1986 June 6, Richard Feynman, “Personal observations on the reliability of the Shuttle”, in Presidential Commission on the Space Shuttle Challenger Accident, Report to the President