- symbol a measure of money supply, including all coins and notes plus personal money in current accounts
- symbol a measure of money supply which includes all coins and notes in circulation, plus personal money in current accounts (i.e. accounts against which cheques can be written), plus traveller’s cheques, and in the USA, money in NOW accounts
- abbreviationnarrow money
- An acronym for a monetary aggregate of an economy's money supply. The U.S. Federal Reserve defines M1 as all currency in circulation, bank checking and savings accounts, NOW, CDs and money market accounts. The European Central Bank defines M1 as all aggregate currency in circulation plus overnight deposits.