Natyashastra
प्रावेशिकी तु प्रथमा द्वितीयाऽक्षेपिकी स्मृता प्रासाधिकी तृतीया च चतुर्थी चान्तरा ध्रुवा निष्क्रामिकी च विज्ञेया पञ्चमी वृत्तकर्मणि आसामेव प्रवक्ष्यामि छन्दोवृत्तसमन्वितम् गान्धर्वं यन् मया प्रोक्तं स्वरतालपदात्मकम् । पदं तस्य भवेद्वस्तु स्वरतालानुभावकम् ॥ २७॥
The first Dhruvā is known as Prāveśikī, the second is remembered as Ākṣepikī, the third is Prāsādikī, the fourth is Antarā Dhruvā, and the fifth, used in the conclusion of the action, is to be known as Naiṣkrāmikī. I shall explain these along with their metres and rhythmic structures. That Gāndharva which I have described as consisting of notes (svara), time-measure (tāla), and words (pada), its structural basis is called Pada, for it reflects the notes and the tāla.
english translation
prAvezikI tu prathamA dvitIyA'kSepikI smRtA prAsAdhikI tRtIyA ca caturthI cAntarA dhruvA niSkrAmikI ca vijJeyA paJcamI vRttakarmaNi AsAmeva pravakSyAmi chandovRttasamanvitam gAndharvaM yan mayA proktaM svaratAlapadAtmakam । padaM tasya bhavedvastu svaratAlAnubhAvakam ॥ 27॥
hk transliteration by Sanscript