[ ik-sten-shuhn ]
/ ɪkˈstɛn ʃən /



of or relating to extension courses.

Origin of extension

1350–1400; Middle English < Latin extēnsiōn- (stem of extēnsiō). See extensive, -ion

SYNONYMS FOR extension

3 lengthening, protraction, continuation.
4 delay.

ANTONYMS FOR extension

Related forms

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for extensionality (1 of 2)


/ (ɪkˌstɛnʃəˈnælɪtɪ) /


logic the principle that sets are definable in terms of their elements alone, whatever way they may have been selected. Thus {a, b}={b, a}={first two letters of the alphabet}

British Dictionary definitions for extensionality (2 of 2)


/ (ɪkˈstɛnʃən) /


Word Origin for extension

C14: from Late Latin extensiō a stretching out; see extend
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

Medicine definitions for extensionality


[ ĭk-stĕnshən ]


The act of straightening or extending a flexed limb.
A pulling or dragging force exerted on a limb in a distal direction.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Science definitions for extensionality


[ ĭk-stĕnshən ]

Mathematics A set that includes a given and similar set as a subset.
Computer Science A set of characters that follow a filename and are separated from it by a period, used to identify the kind of file.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.