of
preposition
[ ɒv ]
• expressing the relationship between a part and a whole.
• expressing the relationship between a scale or measure and a value.
• "an increase of 5%"
• indicating an association between two entities, typically one of belonging, in which the first is the head of the phrase and the second is something associated with it.
• "the son of a friend"
• expressing the relationship between a direction and a point of reference.
• "north of Watford"
• expressing the relationship between a general category or type and the thing being specified which belongs to such a category.
• "the city of Prague"
• following a noun derived from or related to a verb.
• where the head of the phrase is a predicative adjective.
• "it was kind of you to ask"
• indicating the relationship between a verb and an indirect object.
• indicating the material or substance constituting something.
• "the house was built of bricks"
• expressing time in relation to the following hour.
• "it would be just a quarter of three in New York"
Origin:
Old English, of Germanic origin; related to Dutch af and German ab, from an Indo-European root shared by Latin ab and Greek apo .
of-
prefix
• variant spelling of ob- assimilated before f (as in offend ).
be of
• possess intrinsically; give rise to.
• "this work is of great interest and value"