एकवचनं संबुद्धिः

Definition saṃjñā सम्बुद्धिसंज्ञा

The प्रथमा-एकवचन when used in the context of सम्बोधन gets the term 'सम्बुद्धि'.

Word by word (padaccheda)

Term / subject prathamā · ekavacanaTerm / subject prathamā · ekavacana

Term / subject Prathamā (1st case): the term being defined, or the subject of the statement.

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Full reading

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

Commentary

In the case of Vocative, the singular number of the 1st case-affix is called स्मबुद्धि।
The vocative singular is called sambuddhi, when it is employed in the vocation. Thus 6.1.69 declares 'after an inflectien base ending in एङ् or in a short vowel, a consonant is elided if it be that of 'Sambuddhi' as हे राम ॥

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