x:1
nounbefore 12th century{ds||1|a|}
- the 24th letter of the English alphabet
- a graphic representation of this letter
- a speech counterpart of orthographic x
x:2
verb
x
\
circa 1849{ds||1||}
- to mark with an x
- to cancel or obliterate with a series of x's —usually used with out
x:3
abbreviation
x
\
- cross
- ex
- experimental
- extra
x:4
symbol
x
\
- times
- by —used in measurements
- by —used in nonmathematical constructions
X
adjective1970
- of such a nature that admission is denied to persons under a specified age (such as 17) —used before the adoption of NC-17
X-Acto
trademark- —used for a precision cutting hand tool with a sharp, replaceable blade
x-axis
noun1886{ds||1||}
- the axis in a plane Cartesian coordinate system parallel to which abscissas are measured
- one of the three axes in a three-dimensional rectangular coordinate system
X band
noun
X band
\
circa 1946
- a segment of the superhigh-frequency radio spectrum that lies between 5.2 GHz and 10.9 GHz and is used especially for radars and for spacecraft communication
X chromosome
noun
X chromosome
\
1911
- a sex chromosome that usually occurs paired in each female cell and single in each male cell in species in which the male typically has two unlike sex chromosomes
x-coordinate
noun1927
- a coordinate whose value is determined by measuring parallel to an x-axis; specifically : abscissa
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