Longman Dictionary of Contemporary English homepage

Language: Latin
Origin: ultra 'beyond', from ulter; ULTERIOR

ultra-

 prefix
     
ultra-
1 extremely:
an ultra-modern building
He remained ultra-cautious.
an ultra-light jacket
2 technical above and beyond something in a range:
ultrasound (=sound that is too high for humans to hear)
 ➔ infra-
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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