third-person singular present of είμαι (eímai): "he is, she is, it is" · third-person plural present of είμαι (eímai): "they are"
köken: From Ancient Greek εἶναι (eînai), present infinitive of εἰμί (eimí, “I am”). * (For the noun): Semantic loan from German Sein. * (For the 3rd person of verb) According to Babiniotis, not from the infinitive εἶναι (eînai), but from the Byzantine Greek ἔναι (énai) < Ancient Greek ἔνι (éni), a short form of ἔνεστι (énesti, “to be in”), and in unison with the forms είμαι (eímai), είσαι (eísai).
form of だ (da), after uninflecting parts of speech: to be · indicates politeness
eş: どす, だす
köken: The copula です (desu) is thought to be a contracted version of であります (de arimasu), from で (de) + あります (arimasu); however, there are other possibilities, namely でございます (de gozaimasu), from で (de) + ございます (gozaimasu); でする (de suru), from で (de) + する (suru); でおわす (de owasu), from で (de) + おわす (owasu); and でそうろう (de sōrō), from で (de) + そうろう (sōrō).
third-person singular present active indicative of sum
köken: From Proto-Indo-European *h₁ésti. Cognate with Sanskrit अस्ति (ásti), Ancient Greek ἐστί (estí), Old Persian 𐎠𐎿𐎫𐎡𐎹 (a-s-t-i-y /astiy/), Hittite 𒂊𒌍𒍣 (ēszi), Old Church Slavonic ѥстъ (jestŭ), Gothic 𐌹𐍃𐍄 (ist).
aile: h.e., i.e., mihi nomen est, quid est nomen tibi