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.

It is the first example in which scientists have confirmed exactly what is causing the periodic behavior.

From Science Daily • Jun. 2, 2026

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

From Barron's • May 28, 2026

Before we get to this week’s travel news, here’s my periodic reminder to get your travel ducks in a row now if you’re jetting somewhere for the long holiday weekend next week.

From The Wall Street Journal • May 15, 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

“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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