āśrayaśabdena dravyamabhidhīyate teṣāṃ guṇaviśeṣāṇām āśrayas tadāśrayo dravyamity arthaḥ /
The term 'āśraya' denotes Substance, [which is] the substratum of those particular Qualities; thus the meaning is "that substance [which is] their substratum."