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Definition of ultra- prefix from the Oxford Advanced Learner's Dictionary

ultra-

prefix
 
/ʌltrə/
 
/ʌltrə/
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  1. (in adjectives and nouns) extremely; beyond a particular limit
    • ultra-modern
    • ultraviolet
    compare infra-
    Word Originfrom Latin ultra ‘beyond’.
See ultra- in the Oxford Advanced American Dictionary
previously
adverb
 
 
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