lieutenant commander

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noun U.S. Navy.

a commissioned officer ranking next below a commander and next above a lieutenant.

Origin of lieutenant commander

An Americanism dating back to 1830–40
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for lieutenant commander

lieutenant commander


noun

an officer holding commissioned rank in certain navies immediately junior to a commander
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