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Definition of first-day cover noun from the Oxford Advanced Learner's Dictionary

first-day cover

noun
 
/ˌfɜːst deɪ ˈkʌvə(r)/
 
/ˌfɜːrst deɪ ˈkʌvər/
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  1. a specially printed envelope with a stamp that has a postmark with the date that stamps of that design were first sold
trait
noun
 
 
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B2
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