Unknown Soldier

noun
  1. an unidentified soldier killed in battle and buried with honors, the tomb serving as a memorial to all the unidentified dead of a nation's armed forces. The tomb of the American Unknown Soldier, commemorating a serviceman killed in World War I, was established in the Arlington National Cemetery in Virginia in 1921. In 1958, the remains of personnel of World War II and the Korean War were buried alongside the tomb (now called the Tomb of the Unknowns). In 1984, a serviceman of the Vietnam War was interred next to the others.

Origin of Unknown Soldier

First recorded in 1920–25
Also called, British, Unknown Warrior.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for unknown soldier

Unknown Soldier

Warrior

noun
  1. (in various countries) an unidentified soldier who has died in battle and for whom a tomb is established as a memorial to other unidentified dead of the nation's armed forces
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012