महाभारतः mahābhārataḥ - book-12, chapter-299, verse-10

एतस्यापि निशामाहुस्तृतीयमिह कुर्वतः ।
पञ्च कल्पसहस्राणि तावदेवाहरुच्यते ॥१०॥

10. etasyāpi niśāmāhustṛtīyamiha kurvataḥ ,
pañca kalpasahasrāṇi tāvadevāharucyate.

10. etasyā api niśām āhuḥ tṛtīyam iha kurvataḥ
pañca kalpasahasrāṇi tāvat eva ahaḥ ucyate

10. iha kurvataḥ etasyā api niśām tṛtīyam pañca
kalpasahasrāṇi āhuḥ tāvat eva ahaḥ ucyate

10. They declare the night of this (creator), while active here, to be the third (period), lasting five thousand cosmic epochs (kalpas). Exactly that much is also stated to be the day.

Words meanings summery:

• एतस्या (etasyā) - of this creation or entity associated with the night (of this (feminine))

• अपि (api) - also, even, too

• निशाम् (niśām) - the cosmic night, a period of dissolution (night)

• आहुः (āhuḥ) - they say, they declare

• तृतीयम् (tṛtīyam) - the third phase or type of cosmic period (the third)

• इह (iha) - in this context of cosmic cycles (here, in this world/context)

• कुर्वतः (kurvataḥ) - of the cosmic agent (Parameṣṭhī/Brahmā) who is performing creation (of one acting, of one performing, while performing)

• पञ्च (pañca) - five

• कल्पसहस्राणि (kalpasahasrāṇi) - thousands of kalpas (cosmic epochs)

• तावत् (tāvat) - just that much, so much

• एव (eva) - indeed, only, just

• अहः (ahaḥ) - the cosmic day, a period of creation (day)

• उच्यते (ucyate) - is said, is called

Words meanings and morphology

एतस्या (etasyā) - of this creation or entity associated with the night (of this (feminine))

(pronoun)

Genitive, feminine, singular of etad

etad - this

अपि (api) - also, even, too

(indeclinable)

निशाम् (niśām) - the cosmic night, a period of dissolution (night)

(noun)

Accusative, feminine, singular of niśā

niśā - night

आहुः (āhuḥ) - they say, they declare

(verb)

3rd person , plural, active, perfect (lit) of brū

Irregular root, 3rd plural perfect for 'speak', often used in a present sense

Root: brū (class 2)

तृतीयम् (tṛtīyam) - the third phase or type of cosmic period (the third)

(adjective)

Accusative, neuter, singular of tṛtīya

tṛtīya - third

इह (iha) - in this context of cosmic cycles (here, in this world/context)

(indeclinable)

कुर्वतः (kurvataḥ) - of the cosmic agent (Parameṣṭhī/Brahmā) who is performing creation (of one acting, of one performing, while performing)

(participle)

Genitive, masculine, singular of kurvat

kurvat - performing, doing, making

Present Active Participle

from root kṛ (to do/make)

Root: kṛ (class 8)

पञ्च (pañca) - five

(numeral)

कल्पसहस्राणि (kalpasahasrāṇi) - thousands of kalpas (cosmic epochs)

(noun)

Nominative, neuter, plural of kalpasahasra

kalpasahasra - thousand kalpas

Compound type : tatpuruṣa (kalpa+sahasra)

• kalpa – a cosmic epoch, a day of Brahmā
  noun (masculine)
• sahasra – thousand
  noun (neuter)

तावत् (tāvat) - just that much, so much

(adjective)

Nominative, neuter, singular of tāvat

tāvat - so much, as much, just so

एव (eva) - indeed, only, just

(indeclinable)

अहः (ahaḥ) - the cosmic day, a period of creation (day)

(noun)

Nominative, neuter, singular of ahan

ahan - day

उच्यते (ucyate) - is said, is called

(verb)

3rd person , singular, passive, present (lat) of vac

Passive present 3rd singular

Root: vac (class 2)