Declaring function/

i want to write a function which has 2 dimentional array as one of its arguments

_global.getList = function ( type:Number, list[]:Array )

this is giving syntax error,
if i do
_global.getList = function ( type:Number, list:Array )
then there is no error, but then, list is now, single dimentional array, which i dont want.

whats the correct syntax to write it as two dimentional array ??