महाभारतः mahābhārataḥ - book-12, chapter-139, verse-13

त्रेताद्वापरयोः संधौ पुरा दैवविधिक्रमात् ।
अनावृष्टिरभूद्घोरा राजन्द्वादशवार्षिकी ॥१३॥

13. tretādvāparayoḥ saṁdhau purā daivavidhikramāt ,
anāvṛṣṭirabhūdghorā rājandvādaśavārṣikī.

13. tretādvāparayoḥ saṃdhau purā daivavidhikramāt
anāvṛṣṭiḥ abhūt ghorā rājan dvādaśavārṣikī

13. rājan purā daivavidhikramāt tretādvāparayoḥ
saṃdhau ghorā dvādaśavārṣikī anāvṛṣṭiḥ abhūt

13. O king, long ago, by the course of divine decree, at the transition (saṃdhi) between the Tretā and Dvāpara ages (yuga), there was a terrible drought that lasted for twelve years.

Words meanings summery:

• त्रेताद्वापरयोः (tretādvāparayoḥ) - of the Tretā and Dvāpara (yuga) (of the Tretā and Dvāpara (ages/yugas))

• संधौ (saṁdhau) - at the transition (between the two yugas) (in the junction, at the union, at the transition)

• पुरा (purā) - long ago (formerly, anciently, in olden times)

• दैवविधिक्रमात् (daivavidhikramāt) - by the course of divine decree (by the order of divine decree, by divine providence)

• अनावृष्टिः (anāvṛṣṭiḥ) - a drought (drought, absence of rain)

• अभूत् (abhūt) - occurred, there was (was, happened, occurred)

• घोरा (ghorā) - terrible (drought) (terrible, dreadful, fierce, awful)

• राजन् (rājan) - O king (addressing the listener) (O king)

• द्वादशवार्षिकी (dvādaśavārṣikī) - that lasted for twelve years (twelve-year, lasting twelve years)

Words meanings and morphology

त्रेताद्वापरयोः (tretādvāparayoḥ) - of the Tretā and Dvāpara (yuga) (of the Tretā and Dvāpara (ages/yugas))

(noun)

Genitive, masculine, dual of tretādvāpara

tretādvāpara - the Tretā and Dvāpara (ages)

Dvandva compound of Tretā and Dvāpara

Compound type : dvandva (tretā+dvāpara)

• tretā – the second of the four yugas or world ages
  noun (feminine)
• dvāpara – the third of the four yugas or world ages
  noun (masculine)

संधौ (saṁdhau) - at the transition (between the two yugas) (in the junction, at the union, at the transition)

(noun)

Locative, masculine, singular of saṃdhi

saṁdhi - junction, union, treaty, transition

Derived from root dhā (to place) with prefix sam

Prefix: sam

Root: dhā (class 3)

Note: Refers to the period linking the two Yugas.

पुरा (purā) - long ago (formerly, anciently, in olden times)

(indeclinable)

दैवविधिक्रमात् (daivavidhikramāt) - by the course of divine decree (by the order of divine decree, by divine providence)

(noun)

Ablative, masculine, singular of daivavidhikrama

daivavidhikrama - order of divine decree, divine providence

Compound of daiva (divine), vidhi (ordinance), and krama (order)

Compound type : tatpuruṣa (daiva+vidhi+krama)

• daiva – divine, celestial, relating to gods
  adjective (neuter)
  Derived from deva (god)
• vidhi – rule, ordinance, decree, fate
  noun (masculine)
  Derived from root dhā (to place) with prefix vi
  Prefix: vi
  Root: dhā (class 3)
• krama – order, course, series, method
  noun (masculine)
  Derived from root kram (to step)
  Root: kram (class 1)

अनावृष्टिः (anāvṛṣṭiḥ) - a drought (drought, absence of rain)

(noun)

Nominative, feminine, singular of anāvṛṣṭi

anāvṛṣṭi - drought, absence of rain

Negative compound (na-tatpuruṣa) of āvṛṣṭi (rain, shower)

Prefix: an

Root: vṛṣ (class 1)

Note: Subject of abhūt

अभूत् (abhūt) - occurred, there was (was, happened, occurred)

(verb)

3rd person , singular, active, aorist (luṅ) of bhū

Root: bhū (class 1)

Note: The augment 'a' is for past tense.

घोरा (ghorā) - terrible (drought) (terrible, dreadful, fierce, awful)

(adjective)

Nominative, feminine, singular of ghora

ghora - terrible, dreadful, fierce, awful

राजन् (rājan) - O king (addressing the listener) (O king)

(noun)

Vocative, masculine, singular of rājan

rājan - king, ruler

द्वादशवार्षिकी (dvādaśavārṣikī) - that lasted for twelve years (twelve-year, lasting twelve years)

(adjective)

Nominative, feminine, singular of dvādaśavārṣika

dvādaśavārṣika - twelve-year, lasting twelve years

Compound of dvādaśa (twelve) and vārṣika (annual, lasting a year)

Compound type : tatpuruṣa (dvādaśa+vārṣika)

• dvādaśa – twelve
  numeral
• vārṣika – annual, yearly, lasting a year
  adjective (masculine)
  Derived from varṣa (year)