unclassified
Americanadjective
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not assigned to a class or category; not arranged according to characteristics.
Reported instances fall into two main types, with a few unclassified anomalies.
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(of data, documents, etc.) not belonging to a category that is restricted for reasons of security; not secret.
unclassified plans; unclassified information.
adjective
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not arranged in any specific order or grouping
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(of information) not possessing a security classification
-
(of football results) not arranged in any special order or in divisions
Etymology
Origin of unclassified
First recorded in 1860–65; un- 1 + classified
Explanation
Anything that's unclassified hasn't been sorted or organized into a certain category. If your symptoms can't be identified as a specific illness, your doctor may describe you as having an unclassified condition. Science is all about classifying things, putting them into classes or groups based on common traits. Things that haven't been thoroughly studied by scientists remain unclassified, like creatures at the very bottom of the ocean or genes that remain mysterious. Another meaning of this adjective is "not secret," usually when we're talking about documents: "The unclassified pages of notes from the President's meeting were published by the newspapers."
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.
Google has been offering AI tools to civilians and military personnel for unclassified work.
From Los Angeles Times • Mar. 20, 2026
Google and OpenAI have approval for use in unclassified settings but not classified activities.
From The Wall Street Journal • Feb. 27, 2026
The Epstein Files Transparency Act was signed into law in November 2025 and required the DOJ to release all unclassified materials related to the Jeffrey Epstein investigation.
From Salon • Feb. 24, 2026
They have published a Nuclear Posture Review, in classified and unclassified forms, that spelled out the policy.
From Slate • Feb. 3, 2026
He scowled, as though the problem was new to him, a newly unearthed stone of surprising, unclassified color.
From "In Cold Blood" by Truman Capote
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.
