(that) you (pl.) are
verbformal/ɨʃ.tɨˈʒajʃ/low
es·te·jais
Definition
Verb form of the second person plural of the present subjunctive of the verb 'to be' (estar). Used to express doubt, wish, possibility, or condition.
Extremely rare in contemporary Portuguese, considered archaic or literary. The common form is 'estejam'.
I hope that you are well. (archaic/literary equivalent)
It is required that you be present at the session. (archaic/literary equivalent)
Etymology
Do verbo 'estar' (latim 'stare'), conjugação do presente do subjuntivo, 2ª pessoa do plural.