Meaning of “faithful” in the English Dictionary

"faithful" in British English

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uk /ˈfeɪθ.fəl/ us /ˈfeɪθ.fəl/

faithful adjective (LOYAL)

B2 firm and not changing in your friendship with or support for a person or an organization, or in your belief in your principles:

a faithful friend
They are faithful supporters of the Labour Party.
His faithful old dog accompanied him everywhere he went.

C2 If your husband, wife, or partner is faithful, he or she does not have a sexual relationship with anyone else:

Was your wife faithful during your marriage?
He was faithful to his wife throughout their 30-year marriage.
remain faithful to sth

to continue to support or follow something:

He remained faithful to the regime when so many others spoke out against it.
Despite persecution, she remained faithful to her beliefs.

More examples

faithful adjective (RELIGIOUS)

following a particular religion:

faithful Christians
faithful followers of Buddhism

faithfulnoun [ C ]

uk /ˈfeɪθ.fəl/ us /ˈfeɪθ.fəl/

faithful noun [ C ] (SUPPORTER)

someone who continues to support someone or something:

He gave a rousing speech to a room full of party faithfuls (= faithful supporters of a political party).

faithfulnoun [ plural ]

uk /ˈfeɪθ.fəl/ us /ˈfeɪθ.fəl/
the faithful

people who are always loyal to a particular group or organization, especially a political party:

They asked for donations from the party faithful.

the people who believe in a particular religion:

We heard bells calling the faithful to prayer.

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

"faithful" in American English

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us /ˈfeɪθ·fəl/

trusted; loyal:

She has been a faithful employee for 30 years.

If something, such as a copy or recording, is faithful, it is exactly like or very similar to the original:

The painting was a faithful reproduction of the original.

If you are faithful to someone or something, you remain loyal and keep the promises you made:

You've been faithful to your family.

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