complication

noun

com·​pli·​ca·​tion ˌkäm-plə-ˈkā-shən How to pronounce complication (audio)
Synonyms of complicationnext
1
a
: complexity, intricacy
especially : a situation or a detail of character complicating the main thread of a plot
b
: a making difficult, involved, or intricate
c
: a complex or intricate feature or element
d
: a difficult factor or issue often appearing unexpectedly and changing existing plans, methods, or attitudes
2
: a secondary disease or condition developing in the course of a primary disease or condition

Synonyms of complication

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Examples of complication in a Sentence

The negotiations stalled when complications arose. Pneumonia is a common complication of AIDS. She experienced complications during her pregnancy. The patient died of complications from surgery.
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
But after five years, that drop didn't translate into saving people from suffering cardiovascular complications. — Rob Stein, NPR, 7 Nov. 2026 Both are contemporary in spirit—think rose-gold cases, contrasting dark dials, and, of course, additional complications—yet still retain the simple elegance of Genta’s original. — Rachel Cormack, Robb Report, 7 Nov. 2026 And Then There’s AI Artificial intelligence (AI) adds another complication. — Scott Schiller, Forbes.com, 6 Nov. 2026 Measles can cause life-threatening complications, including pneumonia and swelling of the brain. — Landon Mion, FOXNews.com, 6 Nov. 2026 See All Example Sentences for complication

Word History

Etymology

Middle English complicacioun, borrowed from Late Latin complicātiōn-, complicātiō "folding together, conglomeration," from Latin complicāre "to fold together, fold up" + -tiōn-, -tiō, suffix of verbal action — more at complicate entry 2

First Known Use

15th century, in the meaning defined at sense 1a

Time Traveler
The first known use of complication was in the 15th century

Rhymes for complication

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Browse Nearby Words

complicateness
complication
complice
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Cite this Entry

“Complication.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/complication. Accessed 9 Nov. 2026.

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Kids Definition

complication

noun
com·​pli·​ca·​tion ˌkäm-plə-ˈkā-shən How to pronounce complication (audio)
1
a
: an act or instance of complicating something
b
: a situation or detail of character that complicates a plot
c
: a complex feature or element
d
: something that makes a situation more complicated or difficult
we were unable to agree when complications arose
2
: a disease or bodily condition existing at the same time as and affecting the course or severity of another disease or condition

Medical Definition

complication

noun
com·​pli·​ca·​tion ˌkäm-plə-ˈkā-shən How to pronounce complication (audio)
: a secondary disease or condition that develops in the course of a primary disease or condition and arises either as a result of it or from independent causes
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