5.2.48
तस्य पूरणे डट्
Operational rule vidhi
The affix डट् (अ causing the elision of the last vowel with the consonant following it) comes in the sense of 'making full this number' after a Numeral being the Genitive 6th-Case in construction.
Word by word (padaccheda)
Target तस्य ṣaṣṭhī · ekavacanaRight context पूरणे saptamī · ekavacanaSubstitute / term prathamā · ekavacana
- Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).
- 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").
- Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
Dotted words are technical terms. Hover or tap one to see its card.
Pink letters are it-markers (anubandhas), tags dropped by 1.3.9. Hover or tap one for the rule that marks it, or try the it-letter finder.
Full reading
तस्य पूरणे डट्
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
तस्य → डट् / पूरणे
Replace tasya with ḍaṭ when pūraṇe follows. Inherited words (anuvṛtti) may add further conditions.
Commentary
The affix डट् (अ causing the elision of the last vowel with the consonant following it) comes in the sense of 'making full this number' after a Numeral being the Genitive 6th-Case in construction.
That by which a thing is completed is called पूरण ॥ Thus एकादशानां पूरणः = एकादशः the "eleventh" (i. e. the one which, added to ten, completes the eleven). Similarly त्रयोदशः ॥ By this affix, ordinals are formed. The rule therefore, does not apply to a case like this:- पंचानां मुष्टिकानां पूरणो घटः ॥
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.