main memory

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Also see: memory

Concise Oxford English Dictionary © 2008 Oxford University Press:
main1

▶adjective chief in size or importance. ▶noun

• 1 a principal pipe carrying water or gas or a cable carrying electricity.

  ■ (the mains) Brit. the source of public water, gas, or electricity supply through pipes or cables.

• 2 (the main) archaic or literary the open ocean.

• 3 Nautical short for mainsail or mainmast.

– phrases
by main force through sheer strength.
in the main on the whole.

– origin ME: from OE mægen ‘physical force’, reinforced by ON meginn, megn ‘strong, powerful’, both from a Gmc base meaning ‘have power’.

Concise Oxford English Dictionary © 2008 Oxford University Press:
main2

▶noun

• 1 (in the game of hazard) a number (5, 6, 7, 8, or 9) called by a player before dice are thrown.

• 2 historical a match between fighting cocks.

– origin C16: prob. from the phr. main chance.