Definitions:

1. A designation for specific models of various products, roads, or vehicles in different industries. NOUN
   • The M1 motorway is a vital artery for north-south travel in the UK, connecting major cities and facilitating economic activities.
2. A monetary aggregate that includes currency in circulation and overnight deposits. NOUN
   • An increase in M1 might indicate higher consumer spending and liquidity in the economy.
3. Military- Refers to the M1 Garand, which is a semi-automatic rifle that was the standard U.S. service rifle during World War II and the Korean War. NOUN
   • The M1 Garand was hailed as 'the greatest battle implement ever devised' by General George S. Patton.

Synonyms:

• major north-south motorway
• narrow money
• semi-automatic service rifle