Identifier in a Sentence 

Definition of Identifier  

someone or something that classifies or singles out something else

Examples of Identifier in a sentence

Sally was placed in the witness relocation program because “Blue Eyes” McKenzie knew she was his identifier as the person who committed the murder.  
Sometimes gardeners look at the tags stuck in the ground next to the plants because this identifier will reveal the plant’s name and information.  
The identifier of the pills in the bottle could be seen by the patient by looking at the label outside of the bottle.  

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