for all the world

1.  In all respects, precisely, as in She looked for all the world like Greta Garbo. [Late 1300s]
2.  Also, not for the world. Not for anything, not at any price. For example, I wouldn't give up chocolate for all the world, or Not for the world would I reveal your secret. This hyperbolic expression is generally part of a negative statement. [First half of 1800s] For a synonym, see not for love or money.

The adverb has one meaning:

Meaning #1: under any circumstances
  Synonyms: for love or money, for anything, for any price