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.

Supervisors, in turn, develop expertise that an arm’s-length regulator can’t match from periodic filings or post hoc investigations.

From The Wall Street Journal • May 18, 2026

Edmond Halley later became famous for identifying the periodic nature of the bright comet now officially called 1P/Halley.

From Science Daily • May 13, 2026

I always look forward to his periodic columns in the sports section.

From Los Angeles Times • May 2, 2026

Scotland has had periodic agreements for tenancies since 2017, but Wales and Northern Ireland still allow fixed-term contracts.

From BBC • Apr. 28, 2026

“All you have to remember is that every ordinary fraction can be converted into an infinite periodic decimal fraction. See? So 3/7 is 0.428571.”

From "A Wrinkle in Time" by Madeleine L'Engle

Vocabulary lists containing periodic

Freak the Mighty

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Word Generation Science - Introductory Chemistry Concepts

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Essential English Vocabulary, List 3

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