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

 

telco

 noun
noun
BrE BrE//ˈtelkəʊ//
 
; NAmE NAmE//ˈtelkoʊ//
 
(pl. telcos)(used especially in newspapers)
 
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a telecommunications company Telcos were struggling to make money from broadband services. Word Origin 1970s: abbreviation.
See the Oxford Advanced American Dictionary entry: telco