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'Cornet' was the third and lowest grade of commissioned officer in a British cavalry troop, after captain and lieutenant. The cornet carried the troop standard, also known as a "cornet".
The rank of ''Cornet'' was the equivalent of the infantry rank of ensign, and was one of the subaltern ranks (along with lieutenant).
The rank was in use by the time of the English Civil War. It was abolished at the same time that the purchase of commissions in the army was abolished in the Army Reform Act of 1871 and was replaced by Second Lieutenant. In practice, the style "Cornet" is still used for Second Lieutenants in the Blues and Royals and The Queen's Royal Hussars.
The rank also existed in other nation's cavalry troops, such as those of Sweden (''Kornett'') and Imperial Russia (корнет). It is still used in the artillery and cavalry divisions of the Netherlands (''Kornet'').