of - definition in the American English Dictionary - Cambridge Dictionaries Online (US)

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English definition of “of”

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of

preposition  us   /ʌv, ɑv, əv/

of preposition (POSSESSION)

used to show possession, belonging, or origin: She is a friend of mine. The color of his tie matches his suit. Have you read the novels of John Updike?

of preposition (CONTAINING)

containing or consisting of: a bag of groceries a book of short stories a forest of pine trees a bunch of grapes

of preposition (AMOUNT)

used after words or phrases expressing amount, number, or a particular unit: a drop of rain two pounds of potatoes hundreds of people

of preposition (POSITION)

used in expressions showing position: I left the book on top of my desk. I’ve never been north of Montreal.

of preposition (RESULT)

resulting from or having to do with: the joy of family the fear of failure

of preposition (RELATING TO)

about, or relating to: Speaking of Elizabeth, here she is. There’s a chapter on the use of herbs for medicinal purposes.

of preposition (CAUSED BY)

used to show the cause of something: He died of a heart attack. Penny is frightened of spiders. I’m tired of all this criticism.

of preposition (THAT IS/ARE)

that is/are: Sales tax of 7% is included in the price. She could read by the age of five.

of preposition (COMPARING)

used when comparing related things: He’s the oldest of three brothers. Of all his films, this one is my favorite.

of preposition (DONE TO)

done to or involving: the destruction of the rain forests the graduation of the class of 2001

of preposition (DISTANCE FROM)

used in expressions showing distance from something in place or time: We live within a mile of the school. She came within two seconds of beating the world record.

of preposition (TIME)

used in saying what the time is: It’s ten (minutes) of five (= ten minutes before five o’clock).

of preposition (DAYS)

used to describe a particular day: the eleventh of March the first of the month
(Definition of of from the Cambridge Academic Content Dictionary © Cambridge University Press)
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