Meaning of “old” in the English Dictionary

"old" in British English

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oldadjective

uk /əʊld/ us /oʊld/

old adjective (NOT YOUNG/NEW)

A1 having lived or existed for many years:

an old man
We're all getting older.
I was shocked by how old he looked.
Now come on, you're old enough to tie your own shoelaces, Carlos.
I'm too old to be out in the clubs every night.
a beautiful old farm house in the country
a battered old car
That's an old joke - I've heard it about a thousand times.
I think this cheese is old, judging by the smell of it.
too old disapproving UK also a bit old, US also a little old

unsuitable because intended for older people:

Don't you think that book is too old for you?

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old adjective (WHAT AGE)

A1 used to describe or ask about someone's age:

How old is your father?
Rosie's six years old now.
It's not very dignified behaviour for a 54-year-old man.
He's a couple of years older than me.

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old adjective (FROM THE PAST)

A2 [ before noun ] from a period in the past:

I saw my old English teacher last time I went home.
He bought me a new phone to replace my old one.
She showed me her old school.
I saw an old boyfriend of mine.
In my old job I had less responsibility.
Synonym

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old adjective (VERY FAMILIAR)

A2 [ before noun ] (especially of a friend) known for a long time:

She's one of my oldest friends - we met in kindergarten.

[ before noun ] informal used before someone's name when you are referring to or talking to them, to show that you know that person well and like them:

There's old Sara working away in the corner.
I hear poor old Frank's lost his job.

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oldnoun [ plural ]

uk /əʊld/ us /oʊld/

(Definition of “old” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"old" in American English

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oldadjective [ -er/-est only ]

us /oʊld/

old adjective [ -er/-est only ] (EXISTING A LONG TIME)

having lived or existed for a long time in comparison to others of the same kind:

An old man lives there with his dog.
They have a beautiful old farm house in the country.
She got very depressed in her old age (= the time of her life when she was old).

old adjective [ -er/-est only ] (KNOWN A LONG TIME)

(esp. of a friend) known for a long time:

She’s one of my oldest friends.

infml Old is also used to show that you know and like someone:

Poor old Frank broke his arm.

old adjective [ -er/-est only ] (AGE)

having a particular age, or an age suited to a particular activity or condition:

a 14-year-old
Charlie is older than I.
You’re old enough to know better.

old adjective [ -er/-est only ] (PREVIOUS)

from a previous time or a period in the past; former :

Our old house in Lakewood burned down.
Sharon gave her old skates to her younger cousin.

(Definition of “old” from the Cambridge Academic Content Dictionary © Cambridge University Press)