X
noun /eks/
/eks/
(also x)
(plural Xs, X’s, x’s
/ˈeksɪz/
/ˈeksɪz/
)- [countable, uncountable] the 24th letter of the English alphabet
- ‘Xylophone’ begins with (an) X/‘X’.
- [uncountable] (mathematics) used to represent a number whose value is not mentioned
- The equation is impossible for any value of x greater than 2.
- [uncountable] a person, a number, an influence, etc. that is not known or not named
- Let's suppose X knows what Y is doing.
see also X chromosome, X-rated, X-ray