1. 1st

adjective. Indicating the beginning unit in a series.
Synonyms
ordinal first
Antonyms
cardinal back secondary

2. 1st-class mail

noun. Mail that includes letters and postcards and packages sealed against inspection.
Synonyms
first class correspondence 1st class mail first-class mail
Antonyms
low quality inferiority asymmetry radial asymmetry incompatibility
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