Also means
off
Usage Note
ab as a preposition takes the dative and means 'from ... onwards' in time or place (ab Montag, 'from Monday'). As a hugely productive separable prefix ab- it adds the sense of 'away/off', as in abfahren ('to depart') or abnehmen ('to lose weight'). Alone as an adverb it means 'off/away'.
Examples
"Der Zug fährt ab Montag früher."
Natural Translation
From Monday the train leaves earlier.
Literal Translation
The train goes from Monday earlier.

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