Synonyms and Antonyms for first-class-mail

1. first-class (adj.)

very good; of the highest quality

Synonyms: Antonyms:

3. first (adv.)

before anything else

Synonyms: Antonyms:

4. first (adj.)

indicating the beginning unit in a series

Synonyms: Antonyms:

5. first (adv.)

the initial time

Synonyms: Antonyms:

7. class (n.)

a body of students who are taught together

Synonyms: Antonyms:

8. first (n.)

the first or highest in an ordering or series

Synonyms: Antonyms:

10. mail (v.)

send via the postal service

Synonyms: Antonyms: