वाल्मीकि-रामायणम् vālmīki-rāmāyaṇam - book-1, chapter-29, verse-9

मन्त्रवच्च यथान्यायं यज्ञो ऽसौ संप्रवर्तते ।
आकाशे च महाञ् शब्दः प्रादुरासीद्भयानकः ॥९॥

9. mantravacca yathānyāyaṃ yajño'sau saṃpravartate ,
ākāśe ca mahāñ śabdaḥ prādurāsīdbhayānakaḥ.

9. mantravat ca yathānyāyam yajñaḥ asau sam-pravartate
ākāśe ca mahān śabdaḥ prādura-āsīt bhayānakaḥ

9. ca asau yajñaḥ mantravat ca yathānyāyam sam-pravartate
ākāśe ca mahān bhayānakaḥ śabdaḥ prādura-āsīt

9. And this sacrificial ritual (yajña) was being performed according to the sacred verses and proper procedure. Also, a great and terrifying sound arose in the sky.

Words meanings summery:

• मन्त्रवत् (mantravat) - according to sacred verses, ritually, with mantras

• च (ca) - and, also

• यथान्यायम् (yathānyāyam) - according to justice, properly, as is right

• यज्ञः (yajñaḥ) - sacrifice, ritual (yajña)

• असौ (asau) - this (one)

• सम्-प्रवर्तते (sam-pravartate) - proceeds, is being performed, commences

• आकाशे (ākāśe) - in the sky, in space

• च (ca) - and, also

• महान् (mahān) - great, large, mighty

• शब्दः (śabdaḥ) - sound, noise, word

• प्रादुर-आसीत् (prādura-āsīt) - appeared, arose, became manifest

• भयानकः (bhayānakaḥ) - terrifying, dreadful, fearful

Words meanings and morphology

मन्त्रवत् (mantravat) - according to sacred verses, ritually, with mantras

(indeclinable)

Suffix -vat (as an adverb)

Note: Adverbial usage.

च (ca) - and, also

(indeclinable)

यथान्यायम् (yathānyāyam) - according to justice, properly, as is right

(indeclinable)

Adverbial compound (avyayībhāva)

Compound type : avyayībhāva (yathā+nyāya)

• yathā – as, according to, in which way
  indeclinable
• nyāya – rule, method, justice, right, logic
  noun (masculine)
  Prefix: ni
  Root: i (class 2)

Note: Adverbial usage.

यज्ञः (yajñaḥ) - sacrifice, ritual (yajña)

(noun)

Nominative, masculine, singular of yajña

yajña - sacrifice, ritual, worship

From root √yaj (to sacrifice, worship)

Root: yaj (class 1)

Note: Subject of saṃpravartate.

असौ (asau) - this (one)

(pronoun)

Nominative, masculine, singular of adas

adas - that, this (demonstrative pronoun, distant or emphasized)

Note: Refers to yajñaḥ.

सम्-प्रवर्तते (sam-pravartate) - proceeds, is being performed, commences

(verb)

3rd person , singular, middle, present (laṭ) of sam-pravart

Prefixes: sam+pra

Root: vṛt (class 1)

Note: The prefixes 'sam-pra' indicate a continuous or complete action.

आकाशे (ākāśe) - in the sky, in space

(noun)

Locative, masculine, singular of ākāśa

ākāśa - sky, ether, space

Prefix: ā

Root: kāś (class 1)

Note: Locative of place.

च (ca) - and, also

(indeclinable)

महान् (mahān) - great, large, mighty

(adjective)

Nominative, masculine, singular of mahat

mahat - great, large, mighty, important

Note: Agrees with śabdaḥ.

शब्दः (śabdaḥ) - sound, noise, word

(noun)

Nominative, masculine, singular of śabda

śabda - sound, noise, word

Note: Subject of prādura-āsīt.

प्रादुर-आसीत् (prādura-āsīt) - appeared, arose, became manifest

(verb)

3rd person , singular, active, past imperfect (laṅ) of prādurbhū

Prefix: prādur

Root: bhū (class 1)

भयानकः (bhayānakaḥ) - terrifying, dreadful, fearful

(adjective)

Nominative, masculine, singular of bhayānaka

bhayānaka - terrifying, dreadful, frightful

From bhaya (fear) + ānaka (suffix indicating nature or quality)

Note: Agrees with śabdaḥ.