महाभारतः mahābhārataḥ - book-1, chapter-2, verse-66

ततोऽश्वमेधिकं पर्व सर्वपापप्रणाशनम् ।
अनुगीता ततः पर्व ज्ञेयमध्यात्मवाचकम् ॥६६॥

66. tato'śvamedhikaṁ parva sarvapāpapraṇāśanam ,
anugītā tataḥ parva jñeyamadhyātmavācakam.

66. tataḥ aśvamedhikam parva sarvapāpapraṇāśanam
anugītā tataḥ parva jñeyam adhyātmavācakam

66. Then, the Aśvamedhika chapter, which destroys all sins. Following that, the AnuGītā should be understood as a chapter that expounds spiritual knowledge.

Words meanings summery:

• ततः (tataḥ) - then, thereafter (then, thereafter, from there)

• अश्वमेधिकम् (aśvamedhikam) - the Aśvamedhika chapter (chapter on the horse sacrifice) (pertaining to the horse sacrifice)

• पर्व (parva) - chapter, section of a text (chapter, section)

• सर्वपापप्रणाशनम् (sarvapāpapraṇāśanam) - that which removes all sins (destroying all sins)

• अनुगीता (anugītā) - the AnuGītā (a philosophical dialogue within the Aśvamedhika Parva) (AnuGītā (name of a text or section))

• ततः (tataḥ) - then, after that (then, thereafter, from there)

• पर्व (parva) - chapter, section (referring to the AnuGītā as a section) (chapter, section)

• ज्ञेयम् (jñeyam) - should be understood (to be known, intelligible)

• अध्यात्मवाचकम् (adhyātmavācakam) - that expounds spiritual knowledge (describing spiritual matters, expounding on the self)

Words meanings and morphology

ततः (tataḥ) - then, thereafter (then, thereafter, from there)

(indeclinable)

अश्वमेधिकम् (aśvamedhikam) - the Aśvamedhika chapter (chapter on the horse sacrifice) (pertaining to the horse sacrifice)

(adjective)

Nominative, neuter, singular of aśvamedhika

aśvamedhika - relating to the Aśvamedha (horse sacrifice)

derived from aśvamedha ('horse sacrifice')

पर्व (parva) - chapter, section of a text (chapter, section)

(noun)

Nominative, neuter, singular of parva

parva - knot, joint, section, chapter, festival, part

सर्वपापप्रणाशनम् (sarvapāpapraṇāśanam) - that which removes all sins (destroying all sins)

(adjective)

Nominative, neuter, singular of sarvapāpapraṇāśana

sarvapāpapraṇāśana - destroying all sins

Compound type : bahuvrīhi (sarva+pāpa+praṇāśana)

• sarva – all, every, whole
  pronoun (masculine)
• pāpa – sin, evil, wicked
  noun (neuter)
• praṇāśana – destruction, annihilation, removal
  noun (neuter)
  action noun
  from root naś with pra and ni
  Prefixes: pra+ni
  Root: naś (class 4)

अनुगीता (anugītā) - the AnuGītā (a philosophical dialogue within the Aśvamedhika Parva) (AnuGītā (name of a text or section))

(noun)

Nominative, feminine, singular of anugītā

anugītā - AnuGītā (lit. 'subsequent song', a philosophical discourse)

ततः (tataḥ) - then, after that (then, thereafter, from there)

(indeclinable)

पर्व (parva) - chapter, section (referring to the AnuGītā as a section) (chapter, section)

(noun)

Nominative, neuter, singular of parva

parva - knot, joint, section, chapter, festival, part

ज्ञेयम् (jñeyam) - should be understood (to be known, intelligible)

(nominal form)

Nominative, neuter, singular of jñeya

jñeya - to be known, knowable, intelligible

gerundive

from root jñā

Root: jñā (class 9)

अध्यात्मवाचकम् (adhyātmavācakam) - that expounds spiritual knowledge (describing spiritual matters, expounding on the self)

(adjective)

Nominative, neuter, singular of adhyātmavācaka

adhyātmavācaka - speaking of or describing spiritual matters, expounding on the self

Compound type : tatpuruṣa (adhyātman+vācaka)

• adhyātman – the supreme spirit, the individual soul, spiritual, pertaining to the self
  noun (neuter)
  Prefix: adhi
• vācaka – speaker, describer, expressive of
  adjective (masculine)
  agent noun
  from root vac with suffix -aka
  Root: vac (class 2)