Meaning of “valid” in the English Dictionary

"valid" in British English

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validadjective

uk /ˈvæl.ɪd/ us /ˈvæl.ɪd/

B2 based on truth or reason; able to be accepted:

My way of thinking might be different from yours, but it's equally valid.
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B2 A ticket or other document is valid if it is based on or used according to a set of official conditions that often include a time limit:

My passport is valid for another two years.

having legal force:

Is this contract/ticket/agreement still valid?

More examples

  • The judge remarked that ignorance was not a valid defence.
  • For the experiment to be valid, it is essential to record the data accurately.
  • Their arguments were valid a hundred years ago and they still hold good today.
  • You need to trawl through a lot of data to get results that are valid.
  • The voucher is valid between July and December and entitles you to 10% off all overseas flights.
validity
noun [ U ] uk /vəˈlɪd.ə.ti/ us /vəˈlɪd.ə.t̬i/

C2

This research seems to give/lend some validity to the theory that the drug might cause cancer.
validly
adverb uk /ˈvæl.ɪd.li/ us /ˈvæl.ɪd.li/

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

"valid" in American English

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validadjective

us /ˈvæl·ɪd/

based on truth or reason; able to be accepted:

The money was gone, and the only valid conclusion was that someone had stolen it.

A valid document is legally acceptable, usually because it has been done according to official rules:

You must have a valid driver’s license to drive a car.
validity
noun [ U ] us /vəˈlɪd·ɪ·t̬i/

Some experts questioned the validity of the president’s ideas.
validly
adverb /ˈvæl·ɪd·li/

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

"valid" in Business English

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validadjective

uk /ˈvælɪd/ us

a valid ticket, document, agreement, etc. is legal and can be officially accepted, usually for a particular period of time:

Is this ticket still valid?
A credit card is not usually accepted as a valid form of I.D.
Applicants must be in possession of a valid passport.
valid for 6 months, a year, etc. Permits are valid for a year.
The court decided shareholders had a valid claim against the Chairman for his part in the company's downfall.

IT valid data or details are accepted by a computer system because they are correct

that can be accepted as being true or reasonable:

The points she made were perfectly valid.
validly
adverb

Make sure that your company documents have been validly signed.

(Definition of “valid” from the Cambridge Business English Dictionary © Cambridge University Press)