योगवासिष्ठः yogavāsiṣṭhaḥ - book-3, chapter-23, verse-8

अहं जगदिति भ्रान्तिदृश्यस्यादावनुद्भवः ।
यदा ताभ्यामवगतस्यवत्यन्ताभावनात्मकः ॥ ८ ॥

ahaṃ jagaditi bhrāntidṛśyasyādāvanudbhavaḥ ,
yadā tābhyāmavagatasyavatyantābhāvanātmakaḥ 8

8. aham jagat iti bhrāntidṛśyasya ādau anudbhavaḥ
yadā tābhyām avagatasya eva atyantābhāvātmakāḥ

8. yadā tābhyām bhrāntidṛśyasya aham jagat iti ādau
anudbhavaḥ eva avagatasya atyantābhāvātmakāḥ

8. When they both realized the fundamental non-origination of the delusive perception 'I am the world' from its very beginning, then that (non-origination) itself became of the nature of absolute non-existence (atyantābhāva).

Words meanings summery:

• अहम् (aham) - I (as in "I am the world") (I)

• जगत् (jagat) - the world (the world, universe, moving)

• इति (iti) - (marking the preceding phrase as a statement) (thus, so, in this manner, marking quotation)

• भ्रान्तिदृश्यस्य (bhrāntidṛśyasya) - of the delusive appearance (of the delusive appearance/perception)

• आदौ (ādau) - at its very beginning (in the beginning, at first, primarily)

• अनुद्भवः (anudbhavaḥ) - non-origination (non-origination, non-appearance, non-existence)

• यदा (yadā) - when

• ताभ्याम् (tābhyām) - by them (the two practitioners) (by them (dual feminine/neuter))

• अवगतस्य (avagatasya) - of that (non-origination) which was understood (of that which was understood)

• एव (eva) - indeed, itself (indeed, just, only, precisely)

• अत्यन्ताभावात्मकाः (atyantābhāvātmakāḥ) - of the nature of absolute non-existence

Words meanings and morphology

अहम् (aham) - I (as in "I am the world") (I)

(pronoun)

Nominative, singular of aham

aham - I, myself

Note: Part of the quoted statement "I am the world".

जगत् (jagat) - the world (the world, universe, moving)

(noun)

Nominative, neuter, singular of jagat

jagat - the world, universe, people, moving, sentient

Present Active Participle

From root gam (to go) + śatṛ suffix (irregular, derived from gacchati).

Root: gam (class 1)

Note: Part of the quoted statement "I am the world".

इति (iti) - (marking the preceding phrase as a statement) (thus, so, in this manner, marking quotation)

(indeclinable)

भ्रान्तिदृश्यस्य (bhrāntidṛśyasya) - of the delusive appearance (of the delusive appearance/perception)

(noun)

Genitive, neuter, singular of bhrāntidṛśya

bhrāntidṛśya - delusive appearance, illusory perception, that which is seen as an illusion

Compound type : karmadhāraya (bhrānti+dṛśya)

• bhrānti – error, delusion, illusion, confusion
  noun (feminine)
  From root bhram (to wander, to err).
  Root: bhram (class 1)
• dṛśya – visible, perceptible, to be seen, an object of sight, phenomenon, appearance
  noun/adjective (neuter)
  Gerundive (kṛtya)
  From root dṛś (to see) + ya suffix.
  Root: dṛś (class 1)

Note: Qualifies anudbhavaḥ.

आदौ (ādau) - at its very beginning (in the beginning, at first, primarily)

(noun)

Locative, masculine, singular of ādi

ādi - beginning, commencement, origin, first, primary

Note: Qualifies anudbhavaḥ.

अनुद्भवः (anudbhavaḥ) - non-origination (non-origination, non-appearance, non-existence)

(noun)

Nominative, masculine, singular of anudbhava

anudbhava - non-origination, non-appearance, non-existence

an (negation) + udbhava (origination).

Compound type : nañ-tatpurusha (an+udbhava)

• an – not, non-
  indeclinable
  Negative prefix.
• udbhava – origination, birth, production, source
  noun (masculine)
  From ud + bhū (to be, to exist, to become).
  Prefix: ud
  Root: bhū (class 1)

Note: Main subject of the yadā clause's description.

यदा (yadā) - when

(indeclinable)

Correlative adverb to tadā.

Note: Introduces the subordinate clause.

ताभ्याम् (tābhyām) - by them (the two practitioners) (by them (dual feminine/neuter))

(pronoun)

Instrumental, feminine, dual of tad

tad - that, he, she, it

Demonstrative pronoun.

Note: Agent of avagatasya.

अवगतस्य (avagatasya) - of that (non-origination) which was understood (of that which was understood)

(adjective)

Genitive, masculine, singular of avagata

avagata - understood, known, perceived, realized

Past Passive Participle

From ava + gam (to go, to comprehend) + kta suffix.

Prefix: ava

Root: gam (class 1)

Note: Describes anudbhavaḥ.

एव (eva) - indeed, itself (indeed, just, only, precisely)

(indeclinable)

अत्यन्ताभावात्मकाः (atyantābhāvātmakāḥ) - of the nature of absolute non-existence

(adjective)

Nominative, masculine, singular of atyantābhāvātmaka

atyantābhāvātmaka - of the nature of absolute non-existence, consisting of absolute non-existence

atyantābhāva (absolute non-existence) + ātmaka (having the nature of).

Compound type : taddhita (atyantābhāva+ātmaka)

• atyantābhāva – absolute non-existence, complete absence
  noun (masculine)
  ati (overly, very) + anta (end) -> atyanta (absolute, complete) + abhāva (non-existence).
  Prefix: ati
  Root: bhū (class 1)
• ātmaka – having the nature of, consisting of, characterized by
  adjective
  Taddhita suffix akan (aka) from ātman (self, nature).

Note: Predicative adjective for anudbhavaḥ.