नित्यं ङितः

Operational rule vidhi

In case of ङित् लकारs, the ending सकार of the प्रत्ययाः of उत्तमपुरुष is removed.

Word by word (padaccheda)

Substitute / term नित्यम् prathamā · ekavacanaTarget ङितः ṣaṣṭhī · ekavacana

Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).

Dotted words are technical terms. Hover or tap one to see its card.

Full reading

नित्यम् ङितः

Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.

As a rewrite rule (sketch from case endings)

ङितः → नित्यम्

Replace ṅitaḥ with nityam. Inherited words (anuvṛtti) may add further conditions.

Commentary

There is always elision of the स् of the first person of the affixes that come in the room of that ल which has an indicatory ङ्।
The tense-affixes having indicatory ङ् are four, namely, लङ्, लिङ्, लुङ् and लृङ् । In their case, the elision of स् is not optional as was the case in the last sutra, but compulsory. See the table already given. In other words, in the Imperfect, Potential, Aorist and Conditional, the स् is elided in the Ist person. Thus अपचाव, अपचाम। The word नित्यं 'always' is used in order to stop the anuvritti of the word 'optionally'.

Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.