Definition of of
1 —used as a function word to indicate a point of reckoning <north of the lake>
2a —used as a function word to indicate origin or derivation <a man of noble birth>b —used as a function word to indicate the cause, motive, or reason <died of flu>c : by <plays of Shakespeare>d : on the part of <very kind of you>e : occurring in <a fish of the western Atlantic>
3 —used as a function word to indicate the component material, parts, or elements or the contents <throne of gold> <cup of water>
4a —used as a function word to indicate the whole that includes the part denoted by the preceding word <most of the army>b —used as a function word to indicate a whole or quantity from which a part is removed or expended <gave of his time>
5a : relating to : about <stories of her travels>b : in respect to <slow of speech>
6a —used as a function word to indicate belonging or a possessive relationship <king of England>b —used as a function word to indicate relationship between a result determined by a function or operation and a basic entity (as an independent variable) <a function of x> <the product of two numbers>
7 —used as a function word to indicate something from which a person or thing is delivered <eased of her pain> or with respect to which someone or something is made destitute <robbed of all their belongings>
8a —used as a function word to indicate a particular example belonging to the class denoted by the preceding noun <the city of Rome>b —used as a function word to indicate apposition <that fool of a husband>
Examples of of in a sentence
He is a coworker of mine.
I threw out that old shirt of yours.
She's a friend of my mother's.
He had the support of his family to help him.
the plays of William Shakespeare
What is the name of the band?
We admired the courage of the young woman.
the President of the United States
What is the total cost of the repairs?
The value of the antique is high.
Origin and Etymology of of
Middle English, off, of, from Old English, adverb & preposition; akin to Old High German aba off, away, Latin ab from, away, Greek apo
First Known Use: before 12th century
Origin and Etymology of of
First Known Use: circa 1800
Definition of OF
OF Defined for English Language Learners
Definition of of for English Language Learners
: belonging to, relating to, or connected with (someone or something)
—used to indicate that someone or something belongs to a group of people or things
: living or occurring in (a specified country, city, town, etc.)
OF Defined for Kids
Definition of of for Students
1 —used to join an amount or a part with the whole which includes it <most of the children> <the back of the closet>
2 : belonging to, relating to, or connected with <a shirt of his> <the top of the hill>
3 : concerning <I heard the news of your success.>
4 : that is <the city of Rome>
5 : made from <a house of bricks>
6 : that has : with <a man of courage> <a thing of no importance>
7 —used to show what has been taken away <a tree bare of leaves> <cured of disease>
8 —used to indicate the reason for <a fear of spiders>
Seen and Heard
What made you want to look up of? Please tell us where you read or heard it (including the quote, if possible).