Meaning: [eks] 
n. 1. the cardinal number that is the sum of nine and one; the base of the decimal system 2. the 24th letter of the Roman alphabet 3. street names for methylenedioxymethamphetamine. adj. being one more than nine.
n. 1. the cardinal number that is the sum of nine and one; the base of the decimal system 2. the 24th letter of the Roman alphabet 3. street names for methylenedioxymethamphetamine. adj. being one more than nine. 
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1. Make X greater than or equal to zero.
2. was proposed by Mr X and seconded by Mrs Y.
3. In algebra, the sign X usually denotes an unknown quantity.
4. Please x your ideas in the little boxes on the form.http://sentencedict.com/x.html
5. What does x represent in this equation?
6. x and y are unknowns.
7. Let x have the value 25.
8. x is a function of y.
9. 2 x 3 is an easy multiplication.
10. Let x be the sum of a and b.
11. Let x equal 5 and y equal 3.
12. Mr X, the sometime professor of physics.
13. X marks the spot where the treasure is buried.
14. Lex x be the equal of y.
15. The room is 12ft x 9ft.
16. X and Y in the equation are both unknowns.
17. Let's suppose X knows what Y is doing.
18. 'Xylophone' begins with X / 'X'.
19. Write X beside the candidate of your choice.
20. As x approaches infinity y approaches zero.
21. means that x equals y.
22. The conservatory measures approximately 13ft x 16ft.
23. X bears no relation to Y.
24. On your map, X marks the spot where the race begins.
25. The cushions, shown left, measure 20 x 12 inches and cost $39.95.
26. The Jane's "Triple X Album" came out in 1986, and wasn't much cop actually.
27. Witness x stated that she had seen Cooper on repeated occasions.
28. The permutations of x, y and z are xyz, xzy, yxz, yzx, zxy, zyx.
29. Everyone wants to piggyback on the phenomenal success of the X Files.
30. Can the value of y be predicted from the value of x?