拡張の定義と意味 - メリアム・ウェブスター

EXTENSION Definition & Meaning - Merriam-Webster Est. 1828 Dictionary Definition Definition Synonyms Example Sentences Word History Phrases Containing Rhymes Entries Near Cite this Entry Citation Kids Definition Kids Medical Definition Medical Legal Definition Legal More from M-W Show more Show more Citation Kids Medical Legal More from M-W Save Word To save this word, you'll need to log in. Log In extension noun ex·​ten·​sion ik-ˈsten(t)-shən Synonyms of extension Simple Definition A Simple Definition is available from our Learner's Dictionary to help you understand the meaning faster. 1 a : the action of extending : state of being extended extension of the patient's life b : an enlargement in scope or operation Tools are extensions of human hands. 2 a : the total range over which something extends : compass b : denotation sense 4 3 a : the stretching of a fractured or dislocated limb so as to restore it to its natural position b : an unbending movement around a joint in a limb (such as the knee or elbow) that increases the angle between the bones of the limb at the joint compare flexion sense 4a 4 : a property whereby something occupies space 5 : an increase in length of time specifically : an increase in time allowed under agreement or concession I missed the deadline but was given an extension . 6 : a program that geographically extends the educational resources of an institution by special arrangements (such as correspondence courses) to persons otherwise unable to take advantage of such resources 7 a : a part constituting an addition b : a section or line segment forming an additional length c : an extra telephone connected to the principal line d : a length of natural or synthetic hair that is worn attached to one's natural hair e : a series of usually three or four characters following a dot at the end of the name of a computer file that specifies the file's format or purpose 8 : a mathematical set (such as a field or group) that includes a given and similar set as a subset Synonyms of extension Relevance stretching prolongation See All Synonyms & Antonyms in Thesaurus Examples of extension in a Sentence extension of the patient's life He's asking for a contract extension . Make sure that the muscles get the proper amount of extension . I missed the deadline but was granted an extension . 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 . This means that the commitments should help with supply and, by extension , sales. — Zev Fima,alexa Lomonaco, CNBC , 1 May 2026 The South China Morning Post (SCMP) reported that the evolution of the Tiangong is set to begin with the addition of a multifunctional extension to the Tianhe core. — Mrigakshi Dixit, Interesting Engineering , 1 May 2026 But still, Riley said, with an opportunity for amends at the start of the extension . — Ira Winderman, Sun Sentinel , 1 May 2026 By launching the initiative at high-profile events such as the Islamic Arts Biennale in Jeddah, the commission is working to reframe sustainability as a modern extension of the Islamic values of stewardship and the preservation of the Earth. — Fmg Studios, Footwear News , 1 May 2026 See All Example Sentences for extension Word History Etymology Middle English, from Late Latin extension-, extensio , from Latin extendere First Known Use 15th century, in the meaning defined at sense 1a Time Traveler The first known use of extension was in the 15th century See more words from the same century Phrases Containing extension extension agent extension cord extension lead Rhymes for extension attention contention convention declension detention dimension dissension distension intension invention laurentian prehension See All Rhymes for extension Browse Nearby Words extensimeter extension extension agent See all Nearby Words Cite this Entry Style MLA Chicago APA Merriam-Webster “Extension.” Merriam-Webster.com Dictionary , Merriam-Webster, https://www.merriam-webster.com/dictionary/extension. Accessed 4 May. 2026. Copy Citation Kids Definition extension noun ex·​ten·​sion ik-ˈsten-chən 1 : the act of extending : the state of being extended 2 : an increase in time was given an extension to finish his project 3 : education by special programs at a distance from a school 4 a : a part forming an addition or increase b : an extra telephone connected to the main line Medical Definition extension noun ex·​ten·​sion ik-ˈsten-chən 1 : the stretching of a fractured or dislocated limb so as to restore it to its natural position 2 : an unbending movement around a joint in a limb (as the knee or elbow) that increases the angle between the bones of the limb at the joint compare flexion sense 1 Legal Definition extension noun ex·​ten·​sion : an increase in length of time specifically : an increase in the time allowed under an agreement More from Merriam-Webster on extension Nglish: Translation of extension for Spanish Speakers Britannica.com: Encyclopedia article about extension Last Updated: 2 May 2026 - Updated example sentences Love words? 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