A kind of empirical Avagraha (sensation);
after having once known the object such as sound etc., with many of its modes or manifold modes, to know it always in that form; e.g.-to whatever extent the sounds of the tata (stringed musical instrument) etc. were known earlier, to know them exactly to that extent-neither less, nor more.
yathaikadā bahvādirūpeṇāvagataṃ sarvadaiva tathā'vabīidhyamāno dhruvaṃ 'muṇati' ityucyate.
(ViBhā309 Vṛ)
it a vi vissarati dhuvaṃ tū...
(VyaBliā 4108)
yathā prāthamikaṃ śabdagrahaṇaṃ tathāvastliitameva śabdamavagṛhṇāti nonaṃ nābhyadhikatn.
(TaVā 1.16.16)