Gagarin definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
Gagarin, Yuri Alekseyevich 1934-68; Soviet cosmonaut: 1st man to orbit the earth in a space flight (1961)
Gagarin definition by American Heritage Dictionary
, Yuri Alekseyevich 1934-1968.
Soviet cosmonaut. In 1961 he became the first person to travel in space. He was killed while flying a routine aircraft training mission.