periodic

[peer-ee-od-ik] / ˌpɪər iˈɒd ɪk /

ADJECTIVE

at fixed intervals

Synonyms

STRONGEST

annual intermittent monthly occasional recurrent recurring regular repeated routine seasonal sporadic weekly yearly

STRONG

periodical

WEAK

alternate at various times centennial cyclic cyclical daily epochal every once in a while every so often fluctuating hourly infrequent isochronal isochronous on certain occasions on-again-off-again orbital perennial rhythmic serial spasmodic

Antonyms

STRONGEST

constant infrequent unusual

WEAK

continual irregular lasting permanent sporadic variable

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

"NASA and Roscosmos have been working to determine the root cause of the cracks, and Roscosmos manages the issue through operational mitigation measures and periodic partial-repair efforts," she said.

From Barron's • Jun. 5, 2026

Contrarians believe it’s far more revealing to analyze the timers’ behavior whenever the market experiences one of its periodic one-day plunges.

From MarketWatch • May 28, 2026

If Temu does not comply, it faces periodic penalty payments.

From Barron's • May 28, 2026

This property is one reason the periodic table contains so many different elements.

From Science Daily • May 9, 2026

At the Rad Lab, every researcher claimed or was assigned an element from the periodic table as an experimental target, with the most senior staffers getting the most promising substances.

From "Big Science" by Michael Hiltzik

Vocabulary lists containing periodic

Freak the Mighty

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Essential English Vocabulary, List 3

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