1st-class mail


Also found in: Thesaurus.
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
mail - the bags of letters and packages that are transported by the postal service
correspondence - communication by the exchange of letters