/eks/ , v.t., x-ed or x'd /ekst/ , x-ing or x'ing /ek"sing/ .
1. to cross out or mark with or as if with an x (often fol. by out ): to x out an error.
2. to indicate choice, as on a ballot or examination (often fol. by in ): to x in the candidate of your choice.
[ 1840-50 ]
1. ex 1 (def. 1).
2. excess.
3. Stock Exchange.
a. (of stock trading) ex dividend.
b. (of bond trading) See ex interest .
4. experimental.
5. extra.
Symbol.
1. an unknown quantity or a variable.
2. (used at the end of letters, telegrams, etc., to indicate a kiss.)
3. (used to indicate multiplication) times: 8 × 8=64.
4. (used between figures indicating dimensions) by: 3" × 4" (read: "three by four inches"); 3" × 4" × 5" (read: "three by four by five inches").
5. power of magnification: a 50x telescope.
6. (used as a signature by an illiterate person.)
7. cross.
8. crossed with.
9. (used to indicate a particular place or point on a map or diagram.)
10. out of; foaled by: a colt by Flag-a-way x Merrylegs.
11. (used to indicate choice, as on a ballot, examination, etc.)
12. (used to indicate an error or incorrect answer, as on a test.)
13. Math. (in Cartesian coordinates) the x-axis.
14. Chess. captures.
15. a person, thing, agency, factor, etc., of unknown identity.