Help, Help. Words, Words!

[usama01 at maktoob dot com (no no)]

Well actually it's only one word:

supersede (superseded)  

Like in 
    "Emails cannot be canceled or superseded"


please give me some suggestions or even a description about the meaning of
this word. The dictionary gives me too much contradicted meanings, like:  badala
(replaced)
       abtala (canceled)
       nasa'7 (copied)

So which one too choose.

Yours, 

Usama

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