- 1st-class mail as a noun:
- 1
1st-class mail
noun
1 1st-class mail
Mail that includes letters and postcards and packages sealed against inspection.
synonyms: 1st class, first-class mail, first class.
debug info: 0.0429
noun
Mail that includes letters and postcards and packages sealed against inspection.
synonyms: 1st class, first-class mail, first class.
debug info: 0.0429