Natyashastra
विभावयति यस्माच्च नानार्थान् हि प्रयोगतः । शाखाङ्गोपाङ्गसंयुक्तस्तस्मादभिनयः स्मृतः ॥ ७॥
Abhinaya is so called because in the performance ॥ of a play॥ it together with the Śākha, the Aṅga and the Upāṅga explains the meaning of different ॥ things॥.
english translation
vibhAvayati yasmAcca nAnArthAn hi prayogataH । zAkhAGgopAGgasaMyuktastasmAdabhinayaH smRtaH ॥ 7॥
hk transliteration by Sanscript