prasiddhaṃ sādharmyaṃ prasiddhena vā sādharmyaṃ yasya sa prasiddhasādharmyo gavayaḥ, tasmāt tamāśritya, sādhyasya saṃjñāsaṃjñisambandhasya, sādhanam siddhiḥ, upamānam /
[The compound] prasiddhasādharmya [means either] "that which has well-known similarity" or "that which has similarity with something well-known" - [which is] the gavaya; based on that [similarity], [there is] the establishment of what is to be established, [namely] the relation between name and named - [this is] upamāna.