English dictionary
1st-class mail meaning and definition
Definition and meaning of 1st-class mail at MeaningMonkey.org. 1st-class mail meaning and definition in the English Dictionary.1ST-CLASS MAIL noun
Definition of 1st-class mail (noun)
- mail that includes letters and postcards and packages sealed against inspection
- synonyms: 1st class, first class, first-class mail
Source: Princeton University Wordnet