WordWeb Online

1. Someone who assigns labels to the grammatical constituents of textual matter
    
2. Someone who appends or joins one thing to another
   "a theory that was simply added on by some anonymous tagger"
    
3. A computer program that attaches labels to the grammatical constituents of textual matter
   - tagging program

Derived forms: taggers

Type of: computer program, computer programme [Brit], individual, mortal, person, program, programme [Brit, Cdn], somebody, someone, soul

Encyclopedia: Tagger