Englishfor English speakers
referral
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noun
a recommendation to consult the (professional) person or group to whom one has been referred
the insurance company says that you need a written referral from your physician before seeing a specialist
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noun
the act of referring (as forwarding an applicant for employment or referring a matter to an appropriate agency)
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noun
a person whose case has been referred to a specialist or professional group
the patient is a referral from Dr. Bones
letter
Noun
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A letter is a symbol which makes up part of a word.
The word fly has 3 letters: f, l and y.
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A letter is a written message or note.
I received a letter through the post.