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HMAS

American  
  1. Her Majesty's Australian Ship.

  2. His Majesty's Australian Ship.


HMAS British  

abbreviation

  1. His ( or Her) Majesty's Australian Ship

"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