X is the twenty-fourth letter of the English alphabet.
X's and O's
the basic elements of a specified field of work, knowledge , etc.; often, specif., the plays and strategies used in a particular sport
Leo X
original name Giovanni de' Medici . 1475–1521, pope (1513–21): noted for his patronage of Renaissance art and learning ; excommunicated Luther (1521)
Pius X
Saint. original name Giuseppe Sarto . 1835–1914, Italian ecclesiastic ; pope (1903–14). He condemned Modernism (1907) and initiated a new codification of canon law. Feast day: Aug 21
Brand X
a competing brand or product not referred to by name but implied to be of inferior quality
liquid x
a substance that occurs naturally in the brain , used medically as a sedative but also as a recreational drug and alleged aphrodisiac : known as 'liquid ecstasy ' when mixed with alcohol
Charles X
title of Charles Gustavus . 1622–60, king of Sweden , who warred with Poland and Denmark in an attempt to create a unified Baltic state
Malcolm X
original name Malcolm Little. 1925–65, US Black civil-rights leader : assassinated
Christian X
1890–1947, king of Denmark (1912–47) and Iceland (1918–44)
syndrome X
Internal Revenue Service
Generation X
members of the generation of people born between the mid-1960s and the mid-1970s who are seen as being highly educated and underemployed , reject consumer culture, and have little hope for the future