Definition of DELTA noun from the Oxford Advanced Learner's Dictionary

 

DELTA

 noun
noun
BrE BrE//ˈdeltə//
 
; NAmE NAmE//ˈdeltə//
 
[uncountable]
 
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the abbreviation for Diploma in English Language Teaching to Adults (a British qualification from the University of Cambridge now called the Certificate in Teaching English to Speakers of Other Languages for experienced teachers of English as a foreign language)