Definition: long अा as different from short or protracted अ prescribed by the wofd वृद्धि or दीर्घ in the case of अ, or by the word अात् when substituted for another vowel, as for example in the rule आदेच उपदेशेऽशिति and the following: cf. P.VI.1.45, 57; (2) substitute for the ablative affix ङस् after words ending in अ; cf. P. VII.1.12; (3) substitute अात् for a case affix in Vedic Literature, e.g. न ताद् ब्राह्मणाद् निन्दामि Kāś. on VII. 1.39.