Abbreviation of commodore.
"The ship was commanded by Captain Smith, who held the rank of Como."
In plain English: Como is not actually an English noun, so it has no meaning to define in this way.
"As they sat down to eat, he ordered como for everyone at the table."
Province of Lombardy, Italy.
"Como is a beautiful province in northern Italy known for its stunning lakeside scenery and historic architecture."
The word Como was borrowed directly into English from the name of the city in Italy. It entered usage as a proper noun referring to that specific location without changing its original meaning.