continual, continuous, constant, incessant, perpetual, perennial mean characterized by continued occurrence or recurrence. continual often implies a close prolonged succession or recurrence.

Continually & repeatedly (Definition of perpetual from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

PERPETUAL definition: continuing or enduring forever; everlasting. See examples of perpetual used in a sentence.

lasting for ever or for a long time; occurring repeatedly over a long time.

A perpetual act, situation, or state is one that happens again and again and so seems never to end. I thought her perpetual complaints were going to prove too much for me.

There are 15 meanings listed in OED's entry for the word perpetual, six of which are labelled obsolete. See ‘Meaning & use’ for definitions, usage, and quotation evidence.

Definition of perpetual adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

lasting for a very long time. continuing without stopping or interrupting: her perpetual whining about her job. Botany (of a plant or flower) blooming throughout the growing season. Botany a perpetual plant. …

PERPETUAL meaning: 1 : continuing forever or for a very long time without stopping; 2 : happening all the time or very often

Continuing indefinitely without interruption; unceasing; constant. A perpetual nuisance.