未定義の定義と意味 | Dictionary.com

UNDEFINED Definition & Meaning | Dictionary.com Synonyms undefined American [uhn-di- fahynd ] / ˌʌn dɪˈfaɪnd / adjective without fixed limits; indefinite in form, extent, or application. undefined authority; undefined feelings of sadness. not given meaning or significance, as by a definition; not defined or explained. an undefined term. undefined British / ˌʌndɪˈfaɪnd / adjective not defined or made clear the job has remained undefined "Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Other Word Forms undefinable adjective undefinedly adverb undefinedness noun Etymology Origin of undefined First recorded in 1605–15; un- 1 + define ( def. ) + -ed 2 ( def. ) Explanation If something is undefined it's not clear, such as your undefined vacation plans. You know you want to go somewhere during the third week of August, but you just don't know where. You can tell just by looking at it that undefined means "not defined." But you might be surprised that the root define comes from the Old French word defenir , meaning "to end, terminate, determine." In this case, define carries the meaning of "determine," but in a sense "end" and "terminate" apply as well. When you define something, that's the end of it — no more wondering. So if something is undefined, it's not yet determined. Keep Reading on Vocabulary.com Vocabulary lists containing undefined Fish in a Tree Looking to grow your vocabulary? Check out this interactive, curated word list from our team of English language specialists at Vocabulary.com – one of over 17,000 lists we've built to help learners worldwide! UCPS 6th Grade Roots List #3 Interested in learning more words like this one? Our team at Vocabulary.com has got you covered! You can review flashcards, quiz yourself, practice spelling, and more – and it's all completely free to use! 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. The endgame is undefined and unknown, and the bombing of energy and water infrastructure could have high costs for the population, complicating a political transition. From MarketWatch • Mar. 10, 2026 “Vladimir” began shooting in July 2025 in Toronto, which stood in for an undefined liberal arts college town. From Los Angeles Times • Feb. 26, 2026 Without that definition, the structure of the model lacks formal grounding: Without a defined neutral axis, the construction is formally undefined. From Science Daily • Feb. 23, 2026 The department said it was punishing them because they were “uncooperative” with its investigation, citing problems with their documentation including untranslated Italian words, undefined acronyms and failure to provide requested information. From The Wall Street Journal • Nov. 10, 2025 Until then it was a rumor, an undefined, unseen question mark shrouded in fog and surrounded by ice. From "Shipwreck at the Bottom of the World" by Jennifer Armstrong Related Words ambiguous fuzzy unclear 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.