old Definition in Cambridge British English Dictionary
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Definition of "old" - British English Dictionary

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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, Carlo. I'm too old to be out clubbing 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 a bit old judging by the smell of it.too old/a bit old disapproving unsuitable because intended for older people: Don't you think that book is a bit 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's bought me a smart new camera to replace my old one. She showed me her old school. I saw an old boyfriend of mine. In my old job I wasn't given sick-pay.
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old adjective (LANGUAGE)

Old English, French, etc. a language when it was in an early stage in its development

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 at school. [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/
the old
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old people considered together as a group: These cuts in services will particularly affect the old.
(Definition of old from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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