1. [n]  touching a player in a game
2. [n]  one child chases the others; the one who is caught becomes the next chaser
3. [n]  a small piece of cloth
4. [n]  a label made of cardboard or plastic or metal
5. [v]  provide with a name or nickname
6. [v]  attach a tag or label to; "label these bottles"
7. [v]  as in baseball: touch a player while he is holding the ball
8. [v]  supply with rhymes, as of blank verse or prose
9. [v]  go after with the intent to catch

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1. \Tag\, n. [Probably akin to tack a small nail; cf. Sw. tagg
   a prickle, point, tooth.]
   1. Any slight appendage, as to an article of dress; something
      slight hanging loosely; specifically, a direction card, or
      label.
   2. A metallic binding, tube, or point, at the end of a
      string, or lace, to stiffen it.
   3. The end, or catchword, of an actor's speech; cue.
   4. Something mean and paltry; the rabble. [Obs.]
   {Tag and rag}, the lowest sort; the rabble. --Holinshed.
   5. A sheep of the first year. [Prov. Eng.] --Halliwell.
   

2. \Tag\, v. t. [imp. & p. p. {Tagged}; p. pr. & vb. n.
   {Tagging}.]
   1. To fit with, or as with, a tag or tags.
            He learned to make long-tagged thread laces.
                                                  --Macaulay.
            His courteous host . . . Tags every sentence with
            some fawning word.                    --Dryden.
   2. To join; to fasten; to attach. --Bolingbroke.
   3. To follow closely after; esp., to follow and touch in the
      game of tag. See {Tag}, a play.
   

3. \Tag\, v. i.
   To follow closely, as it were an appendage; -- often with
   after; as, to tag after a person.
   

4. \Tag\, n. [From {Tag}, v.; cf. {Tag}, an end.]
   A child's play in which one runs after and touches another,
   and then runs away to avoid being touched.
   

An SGML, HTML, or XML token representing the beginning (start tag: "") or end (end tag: "") of an element. In normal SGML syntax (and always in XML), a tag starts with a "".

In HTML jargon, the term "tag" is often used for an "element".