Meaning of “ultra-” in the English Dictionary

british dictionary

"ultra-" in British English

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ultra-prefix

uk /ʌl.trə-/ us /ʌl.trə-/

(Definition of “ultra-” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"ultra-" in American English

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ultra-prefix

us /ˌʌl·trə/

extreme or extremely:

ultraconservative
ultramodern

(Definition of “ultra-” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"ultra-" in Business English

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ultra-adverb

uk us

used with adjectives to mean 'extremely':

These ultra-thin loudspeakers can be hidden as paintings on a wall.
an ultra-conservative political group
The network uses ultra-fast fiber-optic cable.

(Definition of “ultra-” from the Cambridge Business English Dictionary © Cambridge University Press)