[ uhl-truh ]
/ ˈʌl trə /
going beyond what is usual or ordinary; excessive; extreme.
an extremist, as in politics, religion, fashion, etc.
(initial capital letter)Military. the British code name for intelligence gathered by decrypting German wireless communications enciphered on the Enigma machine during World War II.
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Origin of ultra
Independent use of ultra-, or shortening of words prefixed with it
Definition for ultra (2 of 2)
a prefix occurring originally in loanwords from Latin, with the basic meaning “on the far side of, beyond.” In relation to the base to which it is prefixed, ultra- has the senses “located beyond, on the far side of” (ultramontane; ultraviolet), “carrying to the furthest degree possible, on the fringe of” (ultraleft; ultramodern), “extremely” (ultralight); nouns to which it is added denote, in general, objects, properties, phenomena, etc., that surpass customary norms, or instruments designed to produce or deal with such things (ultramicroscope; ultrasound; ultrastructure).
Origin of ultra-
<Latin ultrā (adv. and preposition) on the far side (of), beyond, derivative of *ult(e)r- located beyond
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020
British Dictionary definitions for ultra (1 of 2)
/ (ˈʌltrə) /
extreme or immoderate, esp in beliefs or opinions
Word Origin for ultra
C19: from Latin: beyond, from ulter distant
British Dictionary definitions for ultra (2 of 2)
beyond or surpassing a specified extent, range, or limitultramicroscopic
extreme or extremelyultramodern
Word Origin for ultra-
from Latin ultrā beyond; see ultra
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
Medical definitions for ultra
Beyond; on the other side of:ultraviolet.
Beyond the range, scope, or limit of:ultrasonic.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.