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PIN definition: a small, slender, often pointed piece of wood, metal, etc., used to fasten, support, or attach things. See examples of pin used in a sentence.

Definition of pin noun in Oxford Advanced American Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

A little piece of stiff wire with a pointed end and a flattened or rounded head, used for fastening things together or holding them in place; straight pin.

Someone's PIN or PIN number is a secret number which they can use, for example, with a bank card to withdraw money from a cash machine or ATM. PIN is an abbreviation for 'personal …

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PINs are generally only decimal digits. A memorized secret typically consisting of only decimal digits. A secret number that a cardholder memorizes and uses to authenticate his or her …