Definition of Arnaut

 
Definition of Arnaut:  an native or inhabitant of Albania or of one of its neighboring mountainous regions especially : an Albanian serving in the Turkish army .
Definizione di Arnaut: un nativo o abitante dell'Albania o di una delle sue vicine regioni montuose in particolare: un Albanese che serve nell'esercito turco.
https://www.merriam-webster.com/dictionary/Arnaut

Malcolm, Noel. "Kosovo, a short history". London: Macmillan, 1998, p.29 "The name used in all these references is, allowing for linguistic variations, the same: 'Albanenses' or 'Arbanenses' in Latin, 'Albanoi' or 'Arbanitai' in Byzantine Greek. (The last of these, with an internal switching of consonants, gave rise to the Turkish form 'Arnavud', from which 'Arnaut' was later derived.)"
Ethnic Groups of Europe: An Encyclopedia; Jeffrey E. Cole - 2011, Page 15, "Arbëreshë was the term self-designiation of Albanians before the Ottoman invasion of the 15 century; similar terms are used for Albanian origins populations living in Greece ("Arvanitika," the Greek rendering of Arbëreshë) and Turkey ("Arnaut," Turkish for the Greek term Arvanitika).
Anscombe 2006b, p. 772. "In this case, however, Ottoman records contain useful information about the ethnicities of the leading actors in the story. In comparison with 'Serbs', who were not a meaningful category to the Ottoman state, its records refer to 'Albanians' more frequently than to many other cultural or linguistic groups. The term 'Arnavud' was used to denote persons who spoke one of the dialects of Albanian, came from mountainous country in the western Balkans (referred to as 'Arnavudluk', and including not only the area now forming the state of Albania but also neighbouring parts of Greece, Macedonia, Kosovo, and Montenegro), organized society on the strength of blood ties (family, clan, tribe), engaged predominantly in a mix of settled agriculture and livestock herding, and were notable fighters — a group, in short, difficult to control. Other peoples, such as Georgians, Ahkhaz, Circassians, Tatars, Kurds, and Bedouin Arabs who were frequently identified by their ethnicity, shared similar cultural traits."