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

STI

noun

/ˌes tiː ˈaɪ/

/ˌes tiː ˈaɪ/

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an infection that is passed from one person to another during sexual activity (the abbreviation for ‘sexually transmitted infection’)
- a fact sheet on the symptoms and treatment of STIs
- STIs cause a wide range of illnesses.
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See STI in the Oxford Advanced American Dictionary

Check pronunciation: STI

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STI

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