महाभारतः mahābhārataḥ - book-5, chapter-130, verse-14

दण्डनीत्यां यदा राजा सम्यक्कार्त्स्न्येन वर्तते ।
तदा कृतयुगं नाम कालः श्रेष्ठः प्रवर्तते ॥१४॥

14. daṇḍanītyāṁ yadā rājā samyakkārtsnyena vartate ,
tadā kṛtayugaṁ nāma kālaḥ śreṣṭhaḥ pravartate.

14. daṇḍanītyām yadā rājā samyak kārtsnyena vartate
tadā kṛtayugam nāma kālaḥ śreṣṭhaḥ pravartate

14. yadā rājā daṇḍanītyām samyak kārtsnyena vartate
tadā kṛtayugam nāma śreṣṭhaḥ kālaḥ pravartate

14. When a king conducts himself properly and fully in accordance with the science of governance (daṇḍanīti), then the most excellent age, called Kṛtayuga, prevails.

Words meanings summery:

• दण्डनीत्याम् (daṇḍanītyām) - in the science of governance, in polity

• यदा (yadā) - when

• राजा (rājā) - king, ruler

• सम्यक् (samyak) - properly, completely, thoroughly, rightly

• कार्त्स्न्येन (kārtsnyena) - thoroughly, completely, fully, in its entirety

• वर्तते (vartate) - conducts himself (acts, behaves, exists, proceeds)

• तदा (tadā) - then, at that time

• कृतयुगम् (kṛtayugam) - the Kṛta age, the Golden Age

• नाम (nāma) - called (by name, indeed, namely)

• कालः (kālaḥ) - age (time, age, period)

• श्रेष्ठः (śreṣṭhaḥ) - best, most excellent, supreme

• प्रवर्तते (pravartate) - prevails (prevails, commences, takes place, goes on)

Words meanings and morphology

दण्डनीत्याम् (daṇḍanītyām) - in the science of governance, in polity

(noun)

Locative, feminine, singular of daṇḍanīti

daṇḍanīti - the science of governance, polity, jurisprudence, penal law

Compound type : tatpurusha (daṇḍa+nīti)

• daṇḍa – stick, staff, punishment, scepter
  noun (masculine)
• nīti – guidance, conduct, policy, ethics, science of polity
  noun (feminine)
  Root: nī (class 1)

यदा (yadā) - when

(indeclinable)

राजा (rājā) - king, ruler

(noun)

Nominative, masculine, singular of rājan

rājan - king, ruler

सम्यक् (samyak) - properly, completely, thoroughly, rightly

(indeclinable)

कार्त्स्न्येन (kārtsnyena) - thoroughly, completely, fully, in its entirety

(noun)

Instrumental, neuter, singular of kārtsnya

kārtsnya - completeness, totality, thoroughness

Derivative from kṛtsna + ṣyañ

वर्तते (vartate) - conducts himself (acts, behaves, exists, proceeds)

(verb)

3rd person , singular, middle, present (laṭ) of vṛt

Present Tense

Root vṛt (1A)

Root: vṛt (class 1)

तदा (tadā) - then, at that time

(indeclinable)

कृतयुगम् (kṛtayugam) - the Kṛta age, the Golden Age

(noun)

Nominative, neuter, singular of kṛtayuga

kṛtayuga - the Kṛta age, the Golden Age (the first and best of the four yugas)

Compound type : tatpurusha (kṛta+yuga)

• kṛta – done, made, accomplished; good deed, virtue
  adjective (neuter)
  Past Passive Participle
  Root kṛ + kta suffix
  Root: kṛ (class 8)
• yuga – age, epoch, yoke
  noun (neuter)

Note: Also accusative. Nominative fits 'is prevailing'.

नाम (nāma) - called (by name, indeed, namely)

(indeclinable)

कालः (kālaḥ) - age (time, age, period)

(noun)

Nominative, masculine, singular of kāla

kāla - time, age, period

श्रेष्ठः (śreṣṭhaḥ) - best, most excellent, supreme

(adjective)

Nominative, masculine, singular of śreṣṭha

śreṣṭha - best, most excellent, supreme

Superlative of praśasya (good)

Note: Agrees with kālaḥ.

प्रवर्तते (pravartate) - prevails (prevails, commences, takes place, goes on)

(verb)

3rd person , singular, middle, present (laṭ) of vṛt

Present Tense

Root vṛt (1A) with prefix pra

Prefix: pra

Root: vṛt (class 1)