Is it ensure, insure, or assure?
Old English geong "youthful, young," from Proto-Germanic *jungas (cf. Old Saxon and Old Frisian jung, Old Norse ungr, Middle Dutch jonc, Dutch jong, Old High German and German jung, Gothic juggs), from PIE *juwngkos, from PIE root *yeu- "vital force, youthful vigor" (cf. Sanskrit yuva "young," Latin juvenis "young," Lithuanian jaunas, Old Church Slavonic junu, Russian junyj "young," Old Irish oac, Welsh ieuanc "young").
From c.1830-1850, Young France, Young Italy, etc., were loosely applied to "republican agitators" in various monarchies; also, especially in Young England, Young America, used generally for "typical young person of the nation." For Young Turk, see Turk.
"young animals collectively, offspring," late 15c., from young (adj.).
Young (yŭng), John. Born 1907.
British biologist whose experiments with the giant nerve cells of squid have contributed to the knowledge of the anatomy and physiology of nerves.
Young , Thomas. 1773-1829.
British physician and physicist who in 1801 postulated the three-color theory of color vision. Young also discovered (1801) astigmatism and described accommodation.
British physicist and physician who is best known for his contributions to the wave theory of light and his discovery of how the lens of the human eye changes shape to focus on objects of different distances. He also studied surface tension and elasticity, and Young's modulus (a measure of the rigidity of materials) is named for him. He is also credited with the first scientific definition of the word energy.