Definition

/ˈleɪbəl/

noun

A small ticket or sign giving information about something to which it is attached or intended to be attached.
“Although the label priced this poster at three pounds, I got it for two.”
A name given to something or someone to categorise them as part of a particular social group.
“Ever since he started going to the rock club, he's been given the label "waster".”
A company that sells records.
“The label signed the band after hearing a demo tape.”
A user-defined alias for a numerical designation, the reverse of an enumeration.
“Storage devices can be given by label or ID.”
A named place in source code that can be jumped to using a GOTO or equivalent construct.

verb

To put a label (a ticket or sign) on (something).
“The shop assistant labeled all the products in the shop.”
(ditransitive) To give a label to (someone or something) in order to categorise that person or thing.
“He's been unfairly labeled as a cheat, although he's only ever cheated once.”
To replace specific atoms by their isotope in order to track the presence or movement of this isotope through a reaction, metabolic pathway or cell.
To add a detectable substance, either transiently or permanently, to a biological substance in order to track the presence of the label-substance combination either in situ or in vitro