Definitions of first-class mail
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mail that includes letters and postcards and packages sealed against inspection
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synonyms:
1st class, 1st-class mail, first class
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types:
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correspondence
communication by the exchange of letters
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card
a rectangular piece of stiff paper used to send messages (may have printed greetings or pictures)
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type of:
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mail
the bags of letters and packages that are transported by the postal service
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correspondence
DISCLAIMER: These example sentences appear in various news sources and books to reflect the usage of the word ‘first-class mail'.
Views expressed in the examples do not represent the opinion of Vocabulary.com or its editors.
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