स्वामिन्नैश्वर्ये

Operational rule vidhi

The irregularly formed word स्वामिन् denotes 'Sir or Lord'.

Word by word (padaccheda)

Substitute / term स्वामिन् prathamā · ekavacanaRight context ऐश्वर्ये saptamī · ekavacana

Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
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

स्वामिन् ऐश्वर्ये

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

Commentary

The irregularly formed word स्वामिन् denotes 'Sir or Lord'.
The affix आमिन् comes in the sense of lordship after the word स्व ॥ Thus स्वमस्यास्ति = ऐश्वर्यमस्यास्ति = स्वामिन् ॥ Why do we say when meaning 'Sir'. Observe, स्ववान् ॥

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