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English definition of “of”

of

preposition (COMPARING)    weak /əv/ strong /ɒv/ US  /ɑːv/
A2 used when comparing related things: I liked the green one best of all . Worst of all was the food ! He's the best looking of the three brothers . I think that of all his films it's my favourite .Comparing and contrasting Grammar:OfOf is a preposition.
(Definition of of preposition (COMPARING) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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