ति विंशतेर्डिति

Operational rule vidhi

The 'ति' of the भसंज्ञक 'विंशति' word is removed.

Word by word (padaccheda)

Word ति Target विंशतेः ṣaṣṭhī · ekavacanaRight context डिति saptamī · ekavacana

Word Case not marked in the source data.
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").

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Full reading

ति विंशतेः डिति

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

Commentary

Of the भ अङ्ग (stem) विंशति , before an affix having an indicatory ड् the ति is elided.
Thus विंशकः = विंशत्या क्रीतः (with ड्वुन् 5.1.24), विंशं शतम्, (विंशतेः पूरणो विंशः, with डट affix 5.2.43, एकविंशः ॥ Why do we say 'having all indicatory ड'? Observe विंशत्या ॥

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