MSA

noun8

1. •
   (US) Initialism of metropolitan statistical area.
2. •
   (UK, Ireland) Initialism of motorway service area.
3. •
   Initialism of multiple system atrophy.
4. •
   Initialism of master service agreement.
5. •
   Initialism of Master Settlement Agreement.
6. •
   Initialism of minimum safe altitude.
7. •
   Initialism of mail submission agent.

   • A “mail submission agent” (MSA) that accepts outgoing mail from an MUA, grooms it, and submits it to the transport system[.] — 2011
8. •
   Abbreviation of mechanically steered array.