महाभारतः mahābhārataḥ - book-3, chapter-23, verse-50

समवायः स राजेन्द्र सुमहाद्भुतदर्शनः ।
आसीन्महात्मनां तेषां काम्यके भरतर्षभ ॥५०॥

50. samavāyaḥ sa rājendra sumahādbhutadarśanaḥ ,
āsīnmahātmanāṁ teṣāṁ kāmyake bharatarṣabha.

50. samavāyaḥ sa rājendra sumahādbhutadarśanaḥ
āsīt mahātmanām teṣām kāmyake bharatarṣabha

50. O best of the Bhāratas, O king of kings, that gathering of those great souls (ātman) in the Kāmyaka forest was truly magnificent to behold.

Words meanings summery:

• समवायः (samavāyaḥ) - assembly, multitude, concourse, combination

• स (sa) - refers to the assembly (that (he, it))

• राजेन्द्र (rājendra) - vocative address (O king of kings, O chief of kings)

• सुमहाद्भुतदर्शनः (sumahādbhutadarśanaḥ) - very great and wonderful to behold, extremely magnificent in appearance

• आसीत् (āsīt) - was, existed

• महात्मनाम् (mahātmanām) - refers to the Pāṇḍavas and their companions (of the great-souled ones, of the noble ones)

• तेषाम् (teṣām) - refers to the mahātmanām (the great-souled ones) (of them, of those)

• काम्यके (kāmyake) - in Kāmyaka (forest)

• भरतर्षभ (bharatarṣabha) - vocative address, likely to Dhṛtarāṣṭra (O best of Bhāratas)

Words meanings and morphology

समवायः (samavāyaḥ) - assembly, multitude, concourse, combination

(noun)

Nominative, masculine, singular of samavāya

samavāya - coming together, assembly, conjunction, combination, multitude

from root i with prefixes sam and ava

Prefixes: sam+ava

Root: i (class 2)

स (sa) - refers to the assembly (that (he, it))

(pronoun)

Nominative, masculine, singular of tad

tad - that, he, she, it

Note: sa is the nominative singular masculine form of tad before voiced consonants or vowels.

राजेन्द्र (rājendra) - vocative address (O king of kings, O chief of kings)

(noun)

Vocative, masculine, singular of rājendra

rājendra - chief of kings, king of kings, sovereign

Compound type : tatpuruṣa (rājan+indra)

• rājan – king, ruler
  noun (masculine)
• indra – chief, foremost, Indra (the god)
  noun (masculine)

सुमहाद्भुतदर्शनः (sumahādbhutadarśanaḥ) - very great and wonderful to behold, extremely magnificent in appearance

(adjective)

Nominative, masculine, singular of sumahādbhutadarśana

sumahādbhutadarśana - very great and wonderful in appearance, extremely magnificent to behold

Compound type : bahuvrīhi (su+mahā+adbhuta+darśana)

• su – good, well, very
  indeclinable
• mahā – great, large, mighty
  adjective (feminine)
• adbhuta – wonderful, astonishing, marvelous
  adjective (neuter)
• darśana – sight, appearance, seeing, beholding
  noun (neuter)
  action noun
  from root dṛś
  Root: dṛś (class 1)

Note: Agrees with samavāyaḥ.

आसीत् (āsīt) - was, existed

(verb)

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

past imperfect

Root: as (class 2)

महात्मनाम् (mahātmanām) - refers to the Pāṇḍavas and their companions (of the great-souled ones, of the noble ones)

(noun)

Genitive, masculine, plural of mahātman

mahātman - great-souled, noble-minded, exalted, a great person

Compound type : bahuvrīhi (mahā+ātman)

• mahā – great, large, mighty
  adjective (feminine)
• ātman – self, soul, spirit, essence, the individual soul or higher self
  noun (masculine)

तेषाम् (teṣām) - refers to the mahātmanām (the great-souled ones) (of them, of those)

(pronoun)

Genitive, masculine, plural of tad

tad - that, he, she, it

Note: agrees with mahātmanām

काम्यके (kāmyake) - in Kāmyaka (forest)

(proper noun)

Locative, neuter, singular of kāmyaka

kāmyaka - name of a forest (Kāmyaka Vana)

Note: Refers to Kāmyaka forest where the Pāṇḍavas resided during their exile.

भरतर्षभ (bharatarṣabha) - vocative address, likely to Dhṛtarāṣṭra (O best of Bhāratas)

(noun)

Vocative, masculine, singular of bharatarṣabha

bharatarṣabha - best of the Bharatas, chief of the Bharatas

Compound type : tatpuruṣa (bharata+ṛṣabha)

• bharata – a descendant of Bharata, name of a king, a region (India)
  proper noun (masculine)
• ṛṣabha – bull, chief, excellent, best
  noun (masculine)