महाभारतः mahābhārataḥ - book-1, chapter-123, verse-13

तस्मिन्नाचार्यवृत्तिं च परमामास्थितस्तदा ।
इष्वस्त्रे योगमातस्थे परं नियममास्थितः ॥१३॥

13. tasminnācāryavṛttiṁ ca paramāmāsthitastadā ,
iṣvastre yogamātasthe paraṁ niyamamāsthitaḥ.

13. tasmīn ācāryavṛttim ca paramām āsthitaḥ tadā
iṣvastre yogam ātatasthe param niyamam āsthitaḥ

13. At that time, observing the highest conduct befitting a teacher (ācāryavṛtti) towards that (image), and having adopted supreme discipline (niyama), he devoted himself to the practice (yoga) of archery.

Words meanings summery:

• तस्मीन् (tasmīn) - to that (earthen image of Drona) (in that, to that)

• आचार्यवृत्तिम् (ācāryavṛttim) - the conduct towards a teacher, reverence for a teacher

• च (ca) - and, also

• परमाम् (paramām) - highest, supreme, utmost

• आस्थितः (āsthitaḥ) - having established, having taken up, having adopted

• तदा (tadā) - then, at that time

• इष्वस्त्रे (iṣvastre) - in archery, in the art of arrows and weapons

• योगम् (yogam) - practice, application, union (yoga)

• आतस्थे (ātasthe) - he undertook, he applied himself to, he devoted himself

• परम् (param) - supreme, highest, excellent

• नियमम् (niyamam) - discipline, self-control, observance (niyama)

• आस्थितः (āsthitaḥ) - having established, having taken up, having adopted

Words meanings and morphology

तस्मीन् (tasmīn) - to that (earthen image of Drona) (in that, to that)

(pronoun)

Locative, masculine, singular of tad

tad - that, he, she, it, this

आचार्यवृत्तिम् (ācāryavṛttim) - the conduct towards a teacher, reverence for a teacher

(noun)

Accusative, feminine, singular of ācāryavṛtti

ācāryavṛtti - the conduct of a teacher, the conduct towards a teacher, teaching profession, the behavior proper to a teacher's disciple

Compound type : tatpurusha (ācārya+vṛtti)

• ācārya – teacher, preceptor, spiritual guide
  noun (masculine)
• vṛtti – conduct, course of action, behavior, profession, livelihood, commentary
  noun (feminine)

च (ca) - and, also

(indeclinable)

परमाम् (paramām) - highest, supreme, utmost

(adjective)

Accusative, feminine, singular of parama

parama - highest, supreme, best, utmost, chief, excellent

आस्थितः (āsthitaḥ) - having established, having taken up, having adopted

(adjective)

Nominative, masculine, singular of āsthita

āsthita - established, situated, fixed, adopted, undertaken, observed

Past Passive Participle

Derived from the root √sthā (to stand) with the prefix ā-.

Prefix: ā

Root: sthā (class 1)

तदा (tadā) - then, at that time

(indeclinable)

इष्वस्त्रे (iṣvastre) - in archery, in the art of arrows and weapons

(noun)

Locative, neuter, singular of iṣvastra

iṣvastra - archery, the art of arrows and weapons, bow and arrow

Compound type : dvandva (iṣu+astra)

• iṣu – arrow, dart
  noun (masculine)
• astra – weapon (especially a missile weapon), dart, arrow
  noun (neuter)

योगम् (yogam) - practice, application, union (yoga)

(noun)

Accusative, masculine, singular of yoga

yoga - union, conjunction, spiritual discipline, practice, application, effort

आतस्थे (ātasthe) - he undertook, he applied himself to, he devoted himself

(verb)

3rd person , singular, middle, perfect (Lit) of ā-√sthā

Prefix: ā

Root: sthā (class 1)

परम् (param) - supreme, highest, excellent

(adjective)

Accusative, masculine, singular of parama

parama - highest, supreme, best, utmost, chief, excellent

नियमम् (niyamam) - discipline, self-control, observance (niyama)

(noun)

Accusative, masculine, singular of niyama

niyama - restraint, self-control, discipline, observance, fixed rule, religious obligation

आस्थितः (āsthitaḥ) - having established, having taken up, having adopted

(adjective)

Nominative, masculine, singular of āsthita

āsthita - established, situated, fixed, adopted, undertaken, observed

Past Passive Participle

Derived from the root √sthā (to stand) with the prefix ā-.

Prefix: ā

Root: sthā (class 1)