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1st-class mail

DEFINITIONS OF: 1st-class mail

1

n mail that includes letters and postcards and packages sealed against inspection

Synonyms:
1st class, first class, first-class mail
Types:
correspondence
communication by the exchange of letters
card
a rectangular piece of stiff paper used to send messages (may have printed greetings or pictures)
Type of:
mail
the bags of letters and packages that are transported by the postal service
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