noun (plural Xs or X's)
1.1Denoting the next after W in a set of items, categories, etc.
- You give the variable operand one of the 4 names #W, #X, #Y, or #Z.
- A participant may answer a multiple-choice question with either the letter answer (W, X, Y or Z) or the verbal answer; however, if the verbal answer is given, it must be exactly as indicated in the question.
1.2Denoting an unknown or unspecified person or thing: there is nothing in the data to tell us whether X causes Y or Y causes X
More example sentences
- Discover how 'Mr X' built an online business making over $100,000 a month (mostly profit) in just 16 weeks.
- A greater number of fresh vegetables are sold in City X than in City Y.
- Regarding Mr. X's remarks about the Directorate of Operations' "pitiful management": I did describe in my article the problem of upwardly mobile mediocrity, but Mr. X is right to fault me for not hammering home the point.
1.4 (usually x) The first unknown quantity in an algebraic expression, usually the independent variable.
[The introduction of x, y, and z as symbols of unknown quantities is due to Descartes (Géométrie, 1637), who took z as the first unknown and then proceeded backward in the alphabet]
- We express a relationship between two variables, which we will refer to as x and y, by stating the following: The value of the variable y depends upon the value of the variable x.
- For the quadratic function y=X^ - 9, determine the values of X such that y>or equal to 7.
1.5 (usually x) Denoting the principal or horizontal axis in a system of coordinates.
- When displaying two variables in a time domain plot, the X-axis is labeled with units of time.
- Click on the Options tab; then choose XY Plot and select the signal to be used for X coordinate generation in the X-Axis box.
2.1Used to indicate a position on a map or diagram.
- In Sweden, X is used by the armed forces on maps to denote that blasting or other type of destruction has been prepared.
- If you happen to camp just North of the straight trail section, the only way to accurately place the X on the map is to use a GPS.
- The students are to use the map to find the sites marked with an X.
2.5Used in place of the signature of a person who cannot write.
- When a person is physically unable to sign his or her name on the voter registration form, he or she may mark an X or take an oath swearing to the statement on the form.
- In many jurisdictions testators may authenticate their last will and testament with the letter X
- In other states the law requires courts to invalidate wills that are signed with an X unless the testator was physically or mentally incapable of signing her full name.
3A shape like that of a letter X: two wires in the form of an X [in combination]: an X-shaped cross
More example sentences
- The design of the Exofit safety harness uses a single piece of material constructed in the shape of an "X" that wraps around the worker.
- These conditions are normally very difficult to achieve, but we can reproduce these conditions by using two (or more) fine wires arranged so that they cross and touch at a single point, in the form of an X, as the load of a pulsed power generator.
- As a compromise, management marked each of the Idles' hands with a large black "X" as a warning to the club's staff not to serve alcohol to the band.
verb (X's, X'ing, X'd)[with object] Back to top
1Mark or make a sign with an X.
- Another day X'ed on my calender.
- Try yellow highlighter X'd on the inside window as one big X or several little X's.
1.1Overwrite or obliterate with an X or series of X’s.
- There are hand-written notes and corrections, done in pencil; in some places whole blocks of text are stricken out, x'd over with a typewriter or opaqued with red crayon.
- Also can he go to court and say that the XXX'd over paragraphs are still valid?
1.2Make void or annul; invalidate: we’re all X-ing things out of our curricula
More example sentences
- Uh, I found more but then accidentally Xed out the page and I'm too lazy to bring it back up.
- X is for X-ing out accidents in your home.
- We're talking about a savings of some $20 million per year alone just by x-ing out this non-essential department completely.
Entry from British & World English dictionary
abbreviationNorth American informal
The drug Ecstasy.
- Many of the users reported that, since "X" only lasts 4 to 5 hours, it brought them the feeling they wanted, and yet they were still able to control themselves unlike with other drugs such as LSD which has a longer duration.
- They also appreciated that using "X" took them away from normal everyday problems.
- I had just turned 18 and we went to a dance club, and my friends all got some "X".
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