1. (noun)tag, ticket a label written or printed on paper, cardboard, or plastic that is attached to something to indicate its owner, nature, price, etc.
2. (noun)tag a label associated with something for the purpose of identification
"semantic tags were attached in order to identify different meanings of the word"
3. (noun)rag, shred, tag, tag end, tatter a small piece of cloth or paper
4. (noun)tag a game in which one child chases the others; the one who is caught becomes the next chaser
5. (noun)tag (sports) the act of touching a player in a game (which changes their status in the game)
6. (verb)tag, label, mark attach a tag or label to
"label these bottles"
7. (verb)tag touch a player while he is holding the ball
8. (verb)tag provide with a name or nickname
9. (verb)chase, chase after, trail, tail, tag, give chase, dog, go after, track go after with the intent to catch
"The policeman chased the mugger down the alley"; "the dog chased the rabbit"
10. (verb)tag supply (blank verse or prose) with rhymes