Etymology
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ensign (n.)

early 15c., "a token, sign, symbol; badge of office, mark or insignia of authority or rank;" also "battle flag, flag or banner of a ship or troop of soldiers," via Scottish, from Old French enseigne (12c.) "mark, symbol, signal; flag, standard, pennant," from Latin insignia (plural); see insignia, which is a doublet of this word. As the word for the soldier who carries the flag, 1510s. U.S. Navy sense of "commissioned officer of the lowest rank" is from 1862. French navy had rank of enseigne de vaisseau at least since early 18c. Until 1871 one of the lowest grades of commissioned officers in a British army infantry regiment, also a rank in the American Revolutionary army.

updated on September 02, 2014

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Definitions of ensign from WordNet

ensign (n.)
a person who holds a commissioned rank in the United States Navy or the United States Coast Guard; below lieutenant junior grade;
ensign (n.)
an emblem flown as a symbol of nationality;
Synonyms: national flag
ensign (n.)
colors flown by a ship to show its nationality;
From wordnet.princeton.edu, not affiliated with etymonline.