lietuvis

Etymology
From, made into a masculine second-declension noun.

Noun

 * 1) a (male) Lithuanian
 * : Lithuanian, pertaining to Lithuania and its people

Usage notes
The basic, neutral term is. The words and  are synonyms, but are much less often used, usually poetically, or in historical contexts (referring to ancient Lithuanians).

Noun

 * 1) Lithuanian; a man from Lithuania

Usage notes
The genitive plural, lietuvių, literally of Lithuanians, is used often when Lithuanian would be used as an adjective in English; for example, lietuvių kalba (Lithuanian language, literally language of Lithuanians). This is common for all nouns that denote nationality.