Definition of "Tag" :

noun: (sports) the act of touching a player in a game (which changes their status in the game)

noun: a game in which one child chases the others; the one who is caught becomes the next chaser

noun: a small piece of cloth or paper

noun: a label written or printed on paper, cardboard, or plastic that is attached to something to indicate its owner, nature, price, etc.

noun: a label associated with something for the purpose of identification

"Semantic tags were attached in order to identify different meanings of the word."

verb: provide with a name or nickname

verb: attach a tag or label to

verb: touch a player while he is holding the ball

verb: supply (blank verse or prose) with rhymes

verb: go after with the intent to catch