[Canada] In the Royal Canadian Navy, the rank of lieutenant commander (LCdr) (capitaine de corvette or capc) is the naval rank equal to major in the army or air force and is the first rank of senior officer. Lieutenant commanders are senior to lieutenants (N) and to army and air force captains, and are junior to commanders and lieutenant co...
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http://en.wikipedia.org/wiki/Lieutenant-commander_(Canada)

Lieutenant commander (also hyphenated lieutenant-commander and abbreviated Lt Cdr, LtCdr. or LCDR) is a commissioned officer rank in many navies. The rank is superior to a lieutenant and subordinate to a commander. The corresponding rank in most armies (armed services) and air forces is major, and in the Royal Air Force and other Commonwealth air ...
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http://en.wikipedia.org/wiki/Lieutenant_commander
[United States] Lieutenant commander (LCDR) is a mid-ranking officer rank in the United States Navy, the United States Coast Guard, the United States Public Health Service Commissioned Corps, and the National Oceanic and Atmospheric Administration Commissioned Officer Corps, with the pay grade of O-4 and NATO rank code OF-3. Lieutenant comm...
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http://en.wikipedia.org/wiki/Lieutenant_commander_(United_States)

[
n] - a commissioned officer in the navy ranking above a lieutenant and below a commander
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http://www.webdictionary.co.uk/definition.php?query=lieutenant%20commander
noun a commissioned officer in the navy ranking above a lieutenant and below a commander
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https://www.encyclo.co.uk/local/20974
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