理論的な、形容詞・名詞の意味、語源など | オックスフォード英語辞典

theoretical, adj. & n. meanings, etymology and more | Oxford English Dictionary Skip to main content Factsheet Etymology Meaning & use Pronunciation Forms Frequency Compounds & derived words Dictionary Historical Thesaurus Factsheet Quotations Hide all quotations Factsheet What does the word theoretical mean? There are eight meanings listed in OED's entry for the word theoretical . See ‘Meaning & use’ for definitions, usage, and quotation evidence. See meaning & use How common is the word theoretical ? About 40 occurrences per million words in modern written English 1750 0.29 1760 0.49 1770 1.3 1780 1.4 1790 2.2 1800 2.1 1810 2.4 1820 3.0 1830 4.2 1840 4.4 1850 5.2 1860 5.1 1870 6.6 1880 7.5 1890 9.6 1900 10 1910 13 1920 15 1930 19 1940 23 1950 31 1960 39 1970 46 1980 47 1990 45 2000 38 2010 38 See frequency What is the etymology of the word theoretical ? theoretical is a borrowing from Latin , combined with an English element. Etymons: Latin theoreticus , ‑al suffix 1 . See etymology What is the earliest known use of the word theoretical ? Earliest known use Middle English The earliest known use of the word theoretical is in the Middle English period (1150—1500). OED's earliest evidence for theoretical is from before 1500, in the writing of George Ripley, alchemist and Augustinian canon. See meaning & use How is the word theoretical pronounced? British English /θɪəˈrɛtᵻkl/ theer-ET-uh-kuhl /ˌθiːəˈrɛtᵻkl/ thee-uh-RET-uh-kuhl U.S. English /ˌθiəˈrɛdək(ə)l/ thee-uh-RED-uh-kuhl /θɪˈrɛdək(ə)l/ theer-ED-uh-kuhl See pronunciation Nearby entries theorem, n. 1551– theorem, v. 1841–91 theorematic, adj. 1645– theorematical, adj. 1634– theorematically, adv. 1652– theorematist, n. 1727– theoremic, adj. 1701– theoremist, n. 1656–66 theorem painting, n. 1821– theoretic, n. & adj. 1601– theoretical, adj. & n. a1500– theoretical framework, n. 1874– theoretically, adv. a1626– theoretical model, n. 1815– theoretician, n. 1782– theoreticism, n. 1902– theoreticist, adj. 1953– theoretico-, comb. form theoretico-philosophical, adj. 1963– theoretico-practical, adj. 1718– theoretics, n. 1670– Browse more nearby entries Etymology Thank you for visiting Oxford English Dictionary To continue reading, please sign in below or purchase a subscription. After purchasing, please sign in below to access the content. 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View our subscription options Personal account Access or purchase personal subscriptions Get our newsletter Save searches Set display preferences Sign in Register Institutional access Sign in through your institution Sign in with library card Sign in with username / password Recommend to your librarian Institutional account management Sign in as administrator on Oxford Academic Entry history for theoretical, adj. & n. theoretical, adj. & n. was revised in June 2015. theoretical, adj. & n. was last modified in December 2025. Revision of the OED is a long-term project, and oed.com is a living text, updated every three months. Modifications may include: corrections and revisions to definitions, especially to improve clarity, accuracy, or intelligibility; new or updated quotation evidence, and reverified or redated bibliographical information; new or updated pronunciations (transcriptions and audio files); new or revised etymological information and improved coverage of variant spellings; new senses or phrases added in print and online updates since OED2 (1989). Revisions and additions of this kind were last incorporated into theoretical, adj. & n. in December 2025. Earlier versions of this entry were published in: OED First Edition (1912) Find out more OED Second Edition (1989) Find out more View theoretical, a. and n. in OED Second Edition Cite Permanent link: Chicago 18 Oxford English Dictionary , “ ,” , . Copy to clipboard Copied to clipboard MLA 9 “ ” Oxford English Dictionary , Oxford UP, , . Copy to clipboard Copied to clipboard APA 7 Oxford University Press. (n.d.). In Oxford English dictionary . Retrieved , from Copy to clipboard Copied to clipboard Select format to download citation .ris (Papers, Zotero) .enw (EndNote) .txt (RefWorks) Download Contribute Please submit your feedback for theoretical, adj. & n. Please include your email address if you are happy to be contacted about your feedback. OUP will not use this email address for any other purpose. Section (required) Factsheet Etymology Meaning & use Pronunciation Forms Frequency Compounds & derived words Other Feedback (required) Submit Citation details Factsheet for theoretical, adj. & n. Browse entry Nearby entries theorem, n. 1551– theorem, v. 1841–91 theorematic, adj. 1645– theorematical, adj. 1634– theorematically, adv. 1652– theorematist, n. 1727– theoremic, adj. 1701– theoremist, n. 1656–66 theorem painting, n. 1821– theoretic, n. & adj. 1601– theoretical, adj. & n. a1500– theoretical framework, n. 1874– theoretically, adv. a1626– theoretical model, n. 1815– theoretician, n. 1782– theoreticism, n. 1902– theoreticist, adj. 1953– theoretico-, comb. form theoretico-philosophical, adj. 1963– theoretico-practical, adj. 1718– theoretics, n. 1670– Browse more nearby entries