Look up: m4

1. m4
   A macro processor for Unix and GCOS which is more flexible than cpp. m4 copies its input to the output, expanding macros which can be either built-in or user-defined. m4 has built-in functions for including files, running Unix commands, doing integer arithmetic, manipulating text in various ways an...
   Found on http://foldoc.org/m4
   
   
2. M4
   A broad measure of money which consists of notes, coins and all deposits with banks and building societies denominated in sterling.
   Found on http://www.bized.co.uk/cgi-bin/glossaryd
   
   
3. M4
   In the UK, includes all M2 items plus Bank wholesale deposits and Certificates of... <a target=_blank href='http://www.finance-glossary.com/terms/M4.htm?id=12375&ginPtrCode=00000&PopupMode=false' title='Read full definition of M4'>more</a>
   Found on http://www.finance-glossary.com/pages/ho
   
   
4. M4
   The UK's main broad measure of money supply...more on M4
   Found on http://moneyterms.co.uk/i/
   
   
5. M4
   The M4 is an American carbine, a short-barrelled version of the Armalite AR-15 M16A2 rifle, and with a collapsible stock produced since 1984. All the mechanical components are interchangeable with those of the M16A2, and it will accept any Armalite AR-15 or NATO STANAG 4179 magazines. It is chambere...
   Found on http://www.probertencyclopaedia.com/brow