समवायान् समवैति

Operational rule vidhi

The affix ठन् and ठक् comes after the words in the Accusative -2nd case in construction denoting combination in the sense 'who assembles there'.

Word by word (padaccheda)

Object समवायान् dvitīyā · bahuvacanaVerb समवैति tiṅanta

Object Dvitīyā (2nd case).
Verb A finite verb form (tiṅanta).

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Full reading

समवायान् समवैति

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

Commentary

The affix ठन् and ठक् comes after the words in the Accusative -2nd case in construction denoting combination in the sense 'who assembles there'.
The word समवाय means 'combination, collection &c'. The word समवायान् is in the plural number in the sutra, indicating that the svarupa-vidhi (1.1. 69) does not apply; the affix being applied not only to the word-form समवाय but to its synonyms also. समवैति means coming together. Thus समवायान् समवैति = सामवायिकः 'who assembles in an assembly'. So also सामाजिकः, सामूहिकः, सान्निवेशिकः ॥

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