Definitions

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.

Periodic, localised bleaching is a natural and even healthy process for reefs.

From Barron's • May 22, 2026

And Periodic Labs, which aims to develop AI to automate scientific research, launched with $300 million in funding in September.

From The Wall Street Journal • Jan. 28, 2026

Periodic aftershocks continued to shake the affected areas on Monday, officials said, forcing already scared people out of their homes.

From Reuters • Oct. 9, 2023

The research group started their work to create a Periodic Table for shapes several years ago.

From Science Daily • Sep. 25, 2023

Molecules do not interest her, she doesn’t seem able to grasp the Periodic Table.

From "Cat's Eye" by Margaret Atwood

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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