A member of any Germanic-language-speaking people, especially a German.
Origin
Attested since 1720, from Latin Teutonēs, Teutonī (cf. Ancient Greek Τεύτονες), a Germanic or Celtic tribe that inhabited a coastal area in today's Germany and devastated Gaul between 113 and 101 BCE. Possibly from Proto-Indo-European *tewtéh₂ ("people"), from which come:
Proto-Celtic *toutā (whence Old Irish túath),
Proto-Germanic *þeudanaz ("ruler, leader of the people") (whence Gothic 𐌸𐌹𐌿𐌳𐌰𐌽𐍃 ("king"),
Old Norse þjóðann ("prince, king"),
Old Saxon þiudan ("lord of the people, ruler"),
Old English þēoden ("king, lord")),
Proto-Germanic *þeudō ("people") (whence Old English þēod ("nation, people, country, language")),