[ uhl-truh ]
/ ˈʌl trə /
Save This Word!
See synonyms for: ultra / ultras on Thesaurus.com


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.



Were you ready for a quiz on this topic? Well, here it is! See how well you can differentiate between the uses of "was" vs. "were" in this quiz.
Question 1 of 7
“Was” is used for the indicative past tense of “to be,” and “were” is only used for the subjunctive past tense.

Meet Grammar Coach

Write or paste your essay, email, or story into Grammar Coach and get grammar helpImprove Your Writing

Meet Grammar Coach

Improve Your Writing
Write or paste your essay, email, or story into Grammar Coach and get grammar help

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. 2021

Example sentences from the Web for ultra

British Dictionary definitions for ultra (1 of 2)

/ (ˈʌltrə) /


extreme or immoderate, esp in beliefs or opinions


an extremist

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.