Real Avagraha (sensation)- That Avagraha, in which there is sensation of only the Sāmānya (generic attribute) and which lasts for only one Samaya (smallest time-unit).
avagraho dvidhā-naiścayiko vyāvahārikaśca. tatra naiścayiko nāma sāmānyaparicchedaḥ, sa caikasāmayikaḥ śāstre'bhihitaḥ.
(TaBhā 1.16 Vṛ)
See - Vyāvahārika Arthāvagraha.