Second-class mail Synonyms

Second-class replaced

Definitions for Second-class


  • (adjective) of little or less value or merit
  • (adjective) of average to below average quality
  • (adjective) of inferior status or quality

Synonyms for phrase

SM abbreviation

SM is an abbreviation for Second-class Mail
What does SM stand for?
SM stands for "Second-class Mail"

Definitions for Mail


  • (noun) communications or parcels sent or carried through the postal system
  • (verb) to send through the postal system
  • (noun) the bags of letters and packages that are transported by the postal service