Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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Generation X the generation following the post-WWII baby boom, esp. those born in the U.S. and Canada in the 1960s and 1970s.
Malcolm X U.S. black nationalist leader and Muslim minister (b.1925--d.1965).
X chromosome the sex chromosome that occurs paired in females and singly in males, and is responsible for female sex characteristics. (Cf. Y chromosome.)
X Games a competitive sporting event with winter and summer versions, featuring a variety of extreme sports, held every few years in different cities.
x-axis in a two-dimensional coordinate system, the horizontal axis, along which the x ordinates are measured. [2 definitions]
X-C abbreviation of "cross-country."
x-radiation application of or exposure to x-rays, esp. as treatment for disease. [2 definitions]
X-rated of a film, performance, or the like, formerly given, or deserving of, a rating of X because of its explicit sexual activity, obscenity, or violence. (see X.)
x-ray a beam of high-energy photons that is able to ionize gases and pass through dense solids. [4 definitions]