नपुंसके भावे क्तः

Operational rule vidhi

The affix क्त is added to the root when action is expressed, the word being in the neuter gender.

Word by word (padaccheda)

Right context नपुंसके saptamī · ekavacanaRight context भावे saptamī · ekavacanaLeft context क्तः pañcamī · ekavacana

Right context Saptamī (7th case): "when X follows", the operation applies to what precedes (1.1.66 तस्मिन्निति निर्दिष्टे पूर्वस्य). Also a condition or domain ("in the sense of").
Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.

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Full reading

नपुंसके भावे क्तः

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

Commentary

The affix क्त is added to the root when action is expressed, the word being in the neuter gender.
These are neuter abstract nouns: thus, हसितम् 'laugh'; जल्पितं 'speech'; शायितं 'sleeping'. So also गतं, सहितं &c.

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