1st-class mail

ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.1st-class mail - mail that includes letters and postcards and packages sealed against inspection1st-class mail - mail that includes letters and postcards and packages sealed against inspection
1st class, first-class mail, first class
mail - the bags of letters and packages that are transported by the postal service
correspondence - communication by the exchange of letters
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