Meaning of “reliable” in the English Dictionary

"reliable" in English

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reliableadjective

uk /rɪˈlaɪ.ə.bəl/ us /rɪˈlaɪ.ə.bəl/

B1 Someone or something that is reliable can be trusted or believed because he, she, or it works or behaves well in the way you expect:

Is your watch reliable?
reliable information
Gideon is very reliable - if he says he'll do something, he'll do it.
Opposite

More examples

reliability
noun [ U ] uk /rɪˌlaɪ.əˈbɪl.ə.ti/ us /rɪˌlaɪ.əˈbɪl.ə.t̬i/

C1

Rolls-Royce cars are famous for their quality and reliability.
reliably
adverb uk /rɪˈlaɪ.ə.bli/ us /rɪˈlaɪ.ə.bli/

I am reliably informed that you have been talking about resigning from the company.

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

"reliable" in American English

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reliableadjective

us /rɪˈlɑɪ·ə·bəl/

deserving trust; dependable:

My car is old but it’s reliable.
reliability
noun [ U ] us /rɪˌlɑɪ·əˈbɪl·ɪ·t̬i/

The reliability of this smoke detector is guaranteed.
reliably
adverb us /rɪˈlɑɪ·ə·bli/

His whereabouts were unknown, but he was reliably reported to be alive.

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

"reliable" in Business English

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reliableadjective

uk /rɪˈlaɪəbl/ us

reliable information or data is accurate or able to be trusted:

Broker-dealers must use their judgment in assessing whether the issuer information is from a reliable source.
reliable information/data/evidence Currently, investors do not always have access to reliable information when they need it.
reliable figures/estimates/indicators The Consumer Price Index is a reasonably reliable indicator of inflation.
more/less reliable Research results are more reliable when they are independent of the person who has conducted the study.

a machine, piece of equipment, or system that is reliable always works well without breaking down:

Consumer demand for fuel-efficient, reliable vehicles is on the increase.
People are often willing to pay a premium for a familiar, reliable service.
While these disks function well as backup storage, they aren't reliable enough for long-term archiving.
more/less/the least, etc. reliable The hard disk on which data is stored is probably the least reliable component in a PC.

a reliable person is someone that you can trust to work hard and do what they say they will do:

Employers want reliable workers.
She's usually very reliable.
reliably
adverb /rɪˈlaɪəbli/

At this stage, long-term costs cannot be reliably estimated.

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

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reliable

In the future there must be no tests on animals for products and their constituents which have already been investigated once and for which reliable results are available.
Thirdly, election rules in the country must be more open and create greater confidence that elections actually are reliable and fair, which has not previously been the case.
The new regulation seeks to ensure that vehicles are safe products, that they are provided with very reliable after sales services and that they respect environmental standards.
The register therefore seems to be an effective and reliable instrument with which the institutions' documents can be identified and queried.
I even find the fourth paragraph of this resolution, which says that we must provide them with more reliable mechanisms, repellent.
Thirdly, reliable and comparable data is lacking.
Moreover, the e-mail system is also being weighed down by this deluge of advertising and is thus becoming unusable for reliable communications.
In fact we have used every source we could find, feeling we should not disregard any important or reliable source available to us.
The result has been an absence of reliable and comparable data, as well as insufficiency in short- and long-term action plans.
I should like to close by saying that these young farmers do not just need reliable policies; they also need good wives and strong families.