Etymology
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Portuguese (n.)

1610s, the language of Portugal, also (1620s) a resident of Portugal; 1660s as an adjective, "of or pertaining to Portugal," from Portuguese Portuguez (see Portugal + -ese). The ending was vulgarly mistaken for a plural in English, and false singular Portugee (by 1821) was formed. Compare Chinee from Chinese; also portegue, portague (1530s), name of a gold coin from Portugal, apparently also a false singular. For Portuguese man-of-war, see man-of-war.

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Definitions of Portuguese
1
Portuguese (n.)
the Romance language spoken in Portugal and Brazil;
Portuguese (n.)
a native or inhabitant of Portugal;
2
Portuguese (adj.)
of or relating to or characteristic of Portugal or the people of Portugal or their language;
Synonyms: Lusitanian
From wordnet.princeton.edu