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In the 19th century, warships (and, later, submarines) began to be built with structures known as "conning towers." These structures were so called because it was from them that an officer could "conn" the vessel. The verb "conn" (also spelled "con") is first known to have appeared in English in the 1600s. It is an alteration of "cond," which is probably an alteration of Middle English "condien" or conduen, meaning "to conduct." Since the 19th century, "conn" has also been used as a noun ("the control exercised by one who conducts or directs the steering of a ship"). This noun, though seldom encountered in general English, is likely familiar to fans of the various Star Trek series in which the directive "You have the conn" is sometimes given from the starship captain to another officer on the bridge.
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“Conn.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/conn. Accessed 4 Mar. 2026.
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