0 the act of putting a small piece of paper, cloth, or metal on something in order to identify it (= say what it is):
The tagging of baggage to and from Macau will provide guests a convenient check-in experience.
The individual tagging of sheep would result in an annual bill of around £20m.
The electronic tagging of household items such as lawn mowers and power drills would enable them to be searchable via the internet.
The case will bring into question the efficacy of electronic tagging of offenders.
1 the activity of marking computer information to be processed dealt with in a particular way:
2 the illegal act of writing your name or a special mark on buildings, or the writing and marks that are put on buildings: