1. a system of currency
2. the Copernican system
3. a chronological system
4. he has a perfect system at roulette
5. the digestive system

1. system noun, a group or combination of interrelated, interdependent, or interacting elements forming a collective entity; a methodical or coordinated assemblage of parts, facts, concepts, etc
2. binary notation or system noun, a number system having a base of two, numbers being expressed by sequences of the digits 0 and 1: used in computing, as 0 and 1 can be represented electrically as off and on
3. (and 13 more)

By Defined by Harper Collins 

Collins English Electronic Dictionary - Digital Edition: 2008 © HarperCollins Publishers 2008