योगवासिष्ठः yogavāsiṣṭhaḥ - book-5, chapter-78, verse-19

यथाभिवाञ्छितध्यानाच्चिरमेकतयोदितात् ।
एकतत्त्वघनाभ्यासात्प्राणस्पन्दो निरुद्ध्यते ॥ १९ ॥

yathābhivāñchitadhyānācciramekatayoditāt ,
ekatattvaghanābhyāsātprāṇaspando niruddhyate 19

19. yathā abhivāñcitadhyānāt ciram ekatayā uditāt
ekatattvaghanābhyāsāt prāṇaspandaḥ niruddhyate

19. prāṇaspandaḥ niruddhyate yathā abhivāñcitadhyānāt
ekatayā uditāt ciram ekatattvaghanābhyāsāt

19. The pulsation of the vital breath (prāṇa) is restrained through prolonged, single-pointed meditation (dhyāna) on a desired object, and also from the intense practice (abhyāsa) focused on a single principle.

Words meanings summery:

• यथा (yathā) - as, just as, in such a manner as

• अभिवाञ्चितध्यानात् (abhivāñcitadhyānāt) - from meditation on what is intensely desired

• चिरम् (ciram) - for a long time, long

• एकतया (ekatayā) - with oneness, by unity, with single-pointedness

• उदितात् (uditāt) - from that which has arisen or intensified

• एकतत्त्वघनाभ्यासात् (ekatattvaghanābhyāsāt) - from intense practice focused on a single principle

• प्राणस्पन्दः (prāṇaspandaḥ) - the vibration of the vital breath

• निरुद्ध्यते (niruddhyate) - is restrained, is stopped, is blocked

Words meanings and morphology

यथा (yathā) - as, just as, in such a manner as

(indeclinable)

अभिवाञ्चितध्यानात् (abhivāñcitadhyānāt) - from meditation on what is intensely desired

(noun)

Ablative, neuter, singular of abhivāñcitadhyāna

abhivāñcitadhyāna - meditation on what is intensely desired

Compound type : tatpuruṣa (abhivāñchita+dhyāna)

• abhivāñchita – intensely desired, wished for
  adjective (neuter)
  Past Passive Participle
  derived from √vāñch (to desire) with prefix abhi-
  Prefix: abhi
  Root: vāñch (class 1)
• dhyāna – meditation, contemplation, thought
  noun (neuter)
  Root: dhyai (class 1)

चिरम् (ciram) - for a long time, long

(indeclinable)

Note: Used adverbially.

एकतया (ekatayā) - with oneness, by unity, with single-pointedness

(noun)

Instrumental, feminine, singular of ekatā

ekatā - oneness, unity

suffix -tā

उदितात् (uditāt) - from that which has arisen or intensified

(adjective)

Ablative, neuter, singular of udita

udita - risen, appeared, uttered, become prominent

Past Passive Participle

derived from √vad (to speak) with prefix ud- (here implying rising/intensifying)

Prefix: ud

Root: vad (class 1)

Note: Refers to the meditation (dhyāna) implied by context.

एकतत्त्वघनाभ्यासात् (ekatattvaghanābhyāsāt) - from intense practice focused on a single principle

(noun)

Ablative, masculine, singular of ekatattvaghanābhyāsa

ekatattvaghanābhyāsa - intense practice of a single principle

Compound type : tatpuruṣa (ekatattva+ghana+abhyāsa)

• eka – one, single
  numeral
• tattva – truth, reality, principle, essence
  noun (neuter)
• ghana – dense, firm, intense
  adjective
• abhyāsa – practice, repetition, study
  noun (masculine)
  derived from √as (to throw) with prefix abhi-
  Prefix: abhi
  Root: as (class 4)

प्राणस्पन्दः (prāṇaspandaḥ) - the vibration of the vital breath

(noun)

Nominative, masculine, singular of prāṇaspanda

prāṇaspanda - vibration of the vital breath, pulsation of prāṇa

Compound type : tatpuruṣa (prāṇa+spanda)

• prāṇa – vital breath, life force
  noun (masculine)
  Prefix: pra
  Root: an (class 2)
• spanda – vibration, pulsation, throbbing
  noun (masculine)
  Root: spand (class 1)

निरुद्ध्यते (niruddhyate) - is restrained, is stopped, is blocked

(verb)

3rd person , singular, passive, present (laṭ) of rudh

Present Passive

derived from √rudh with prefix ni-

Prefix: ni

Root: rudh (class 7)