Definition of "tagger"

One who or that which tags.

1. The player who tries to catch others in the game of tag.  quotations  examples

   Quotations

   • The teacher then calls on each one of the tagged to identify his tagger. If a student cannot guess correctly, he must sit down.

     1989, Francis Edward Abernethy, Texas Toys and Games, page 111

2. A person who writes graffiti using a specific mark  examples

3. (computing theory) A program or algorithm that adds tags for purposes of categorization, e.g. grammatical information to words in a document, or genres to songs in a music collection.  quotations  examples

   Quotations

   • To include part-of-speech (POS) information, the corpus was tagged using the CLAWS tagger.

     2018, Clarence Green, James Lambert, “Advancing disciplinary literacy through English for academic purposes: Discipline-specific wordlists, collocations and word families for eight secondary subjects”, in Journal of English for Academic Purposes, volume 35, page 109

A device for removing taglocks from sheep.  examples

That which is pointed like a tag.  quotations  examples

(slang) The penis.

(in the plural) Sheets of tin or other plate which run below the gauge.  examples