अन्तर्भिन्नपदत्वेऽप्येकनामत्वेन योजनं समासः । स च परस्परसम्बन्धार्थानां स्वाद्यन्तानाम् ।
antar-bhinna-padatve’py eka-nāmatvena yojanaṁ samāsaḥ | sa ca paraspara-sambandhārthānāṁ sv-ādy-antānām |
(Vṛtti on Hari-nāmāmṛta-vyākaraṇa: 1273; Hari-nāmāmṛta-vyākaraṇa: 1682–3)
“Although possessed of separate words (padas) internally, a joining [of two or more words] into one nāma is [called] compounding (samāsa). It [i.e., compounding], furthermore, is [only] for those [padas (words)] the meaning of which have a relationship with one another and which [typically] end in the svādis [i.e., the suffixes (viṣṇubhaktis) su and so on, meaning, words that are already declined].”
Commentary
paraspara-grahaṇam anya-sāpekṣatā-nirāsārtham |
(Vṛtti on Hari-nāmāmṛta-vyākaraṇa: 1683)
“The inclusion of ‘with one another’ (paraspara) is for the sake of exclusion of dependence on another [word, i.e., one that is not in the compound].”