identifierPronunciation: /ʌɪˈdɛntɪfʌɪə/Definition of identifier noun 1a person or thing that identifies someone or something:the new NHS number is to be known as the ‘unique patient identifier’ Computing a sequence of characters used to identify or refer to a program or an element, such as a variable or a set of data, within it. 2a person who identifies with something or someone:Labour identifiers and left-wingersidentifier in other Oxford dictionaries Definition of identifier in the US English dictionary