प्रत्ययः

This is an aphorism intended solely to regulate the sense of others. From this place forward up to the end of the Fifth Book, whatsoever we shall treat of, will get the name of 'Pratyaya' or an affix, except the 'prakriti' or base (such as गुप्, तिम्, कित् in (III. I. 5) are bases, the affix being सन्), the 'upapada' or dependent word (such as स्तम्ब, शकृत in 3.2.24 are upapadas), the 'upadhi' or attribute, the special cause that occasions changes (such as पशु in III. 2. 25 is an upadhi); in the sutra, 3.2.25, the word हरति is a prakriti, दृति and नाथ are upapadas, पशु is an upadhi, the affix being इन्, the substitute and the augment. Such as the affixes तव्यत्, तव्य, अनीयर् taught in (III. I. 96), as कर्त्तव्यम्, करणीयम् 'to be done'.,