How do you define 'unwanted code'?

Question

How would you define "unwanted code"?

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Edit:

IMHO, Any code member with 0 active calling members (checked recursively) is unwanted code. (functions, methods, properties, variables are members)

Answer 1

0 active calls and no possibility of use in near future. And I prefer to never comment out anything in case I need for it later since I use SVN (source control).