accidental
Americanadjective
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happening by chance or accident; not planned; unexpected.
an accidental meeting.
- Synonyms:
- unintentional
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nonessential; incidental; subsidiary.
accidental benefits.
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Music. relating to or indicating sharps, flats, or naturals.
noun
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a nonessential or subsidiary circumstance, characteristic, or feature.
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Music. a sign placed before a note indicating a chromatic alteration of its pitch.
adjective
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occurring by chance, unexpectedly, or unintentionally
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nonessential; incidental
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music denoting sharps, flats, or naturals that are not in the key signature of a piece
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logic (of a property) not essential; contingent
noun
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an incidental, nonessential, or supplementary circumstance, factor, or attribute
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music a symbol denoting a sharp, flat, or natural that is not a part of the key signature
Usage
What does accidental mean? Accidental describes something that happens by chance or without planning, as in The hero has an accidental meeting with the villain early in the movie that sets the hero on his course. Accidental can also sometimes refer to something that comes about by chance. Example: We had to sign a contract saying we are aware of the possibility of accidental injury.
Synonym Usage
Accidental, casual, fortuitous all describe something outside the usual course of events. Accidental implies occurring unexpectedly or by chance: an accidental blow. Casual describes a passing event of slight importance: a casual reference. Fortuitous is applied to events occurring without known cause, often of a fortunate or favorable nature: a fortuitous shower of meteors. It often also implies good luck or good fortune: a fortuitous choice leading to rapid advancement.
Other Word Forms
Derived Forms
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accidentalitynoun
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accidentalnessnoun
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nonaccidentalnessnoun
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nonaccidentaladjective
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preaccidentaladjective
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pseudoaccidentaladjective
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quasi-accidentaladjective
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unaccidentaladjective
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accidentallyadverb
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accidentlyadverb
Inflected Forms
Nouns
Etymology
Origin of accidental
First recorded in 1350–1400; Middle English word from Medieval Latin word accidentālis. See accident, -al 1
Explanation
Anything accidental happens by chance or unintentionally. People don't mean to do accidental things. An accident is something unforeseen that no one wanted to happen, like a car accident or getting hit by lightning. You can describe anything like that as accidental. Bumping into a stranger could be accidental. Forgetting to pay a bill is accidental. This word covers all the things that no one really meant or planned to happen. There are a lot of accidental events in the world, which is one reason insurance exists.
Vocabulary lists containing accidental
"Culture Clash"
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Music - High School
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Florida's B.E.S.T. Common Suffixes: -al, -ial
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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’s accidental that the U.K. is more acutely unstable than the U.S.,
From The Wall Street Journal • Jun. 25, 2026
Across the UK, 202 people died in accidental water-related incidents in 2025, according to the National Water Safety Forum, external.
From BBC • Jun. 20, 2026
We then used artificial intelligence to classify each document match, distinguishing meaningful contact with Epstein from accidental mentions.
From Salon • Jun. 20, 2026
The population collapse has been caused primarily by accidental entanglement in gillnets, especially those used to illegally catch totoaba.
From Science Daily • Jun. 17, 2026
But in an indirect and accidental way, it also energized the market ladies and traveling entrepreneurs who would give Shin sustenance, cover, and guidance in his escape to China.
From "Escape from Camp 14: One Man's Remarkable Odyssey from North Korea to Freedom in the West" by Blaine Harden
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
