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Definition of mail slot noun from the Oxford Advanced Learner's Dictionary

mail slot

noun
 
/ˈmeɪl slɒt/
 
/ˈmeɪl slɑːt/
(North American English)
(British English letter box)
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  1. a narrow opening in a door or wall through which mail is delivered
See mail slot in the Oxford Advanced American Dictionary

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trait
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