Synonyms and Antonyms for first-class_mail

2. first (adv.)

before anything else

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3. first (adj.)

indicating the beginning unit in a series

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4. first (adv.)

the initial time

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5. first (adv.)

before another in time, space, or importance

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6. first (n.)

the first or highest in an ordering or series

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7. first-class mail (n.)

mail that includes letters and postcards and packages sealed against inspection

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8. first (n.)

the first element in a countable series

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9. first (adj.)

serving to begin

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10. first (adj.)

serving to set in motion

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