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

 

STI

 noun
noun
BrE BrE//ˌes tiː ˈaɪ//
 
; NAmE NAmE//ˌes tiː ˈaɪ//
 
 
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the abbreviation for sexually transmitted infection (an infection that is passed from one person to another during sexual activity) a fact sheet on the symptoms and treatment of STIs STIs cause a wide range of illnesses
See the Oxford Advanced American Dictionary entry: STI