4.2.124
जनपदतदवध्योश्च
Operational rule vidhi
The affix वुञ् comes in the remaining senses after a वृद्ध word denoting an inhabited kingdom or a limit of such kingdom
Word by word (padaccheda)
Target जनपद- तद्- अवध्योः ṣaṣṭhī · dvivacanaIndeclinable च avyaya
- Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).
- Indeclinable An avyaya such as च "and", वा "optionally", न "not".
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Full reading
जनपद-
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The affix वुञ् comes in the remaining senses after a वृद्ध word denoting an inhabited kingdom or a limit of such kingdom
The phrases वृद्धात् and देशे are understood here, being qualified by जनपद and तदवधि ॥ This debars the affix छ ॥ Thus आभिसारकः and आदर्शकः are examples of जनपद ॥ And औपुष्टकः and श्यामायनकः from औपुष्ट and श्यामायन two uninhabited countries, are illustrations of जनपदावधि ॥
The अवधि or limit of an inhabited country or जनपद must be a country and not a village. This is so, in order to prevent, by anticipation, the application of छ by 4.2.137 to words like त्रिगर्त्त which is an arid desert: as त्रैगर्त्तकः ॥ The word तदवधि means either "the boundary of that (जनपद)" or "that which itself is a boundary".
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.