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.
2A cross-shaped written symbol, in particular.
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".
What do you find interesting about this word or phrase?
Comments that don't adhere to our Community Guidelines may be moderated or removed.