5.2.25
पक्षात्तिः
Operational rule vidhi
The affix ति comes in the sense of 'the root of it' after the word पक्ष in the Genitive 6th-Case in construction.
Word by word (padaccheda)
Left context पक्षात् pañcamī · ekavacanaSubstitute / term तिः prathamā · ekavacana
- Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
- Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
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Full reading
पक्षात् तिः
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The affix ति comes in the sense of 'the root of it' after the word पक्ष in the Genitive 6th-Case in construction.
The word मूल of the last sutra is drawn into this aphorism; and not the word पाक as well. This is an exceptional case of अनुवृत्ति, generally the whole is drawn and not a portion. Hence arises the following maxim क्वचिदेकदेशोऽप्यनुवर्तते "Sometimes it also happens that only a part of the words of a rule which are mutually connected is valid in a subsequent rule, while the rest ceases to be valid".
Thus पक्षस्य मूलं = पक्षतिः i. e. प्रतिपत् 'the root or the first day of a Paksha or a fortnight'.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.