Shaktyavesh Avatar (Devanagari: शक्त्यवेश अवतार, IAST: śaktyaveśa avatāra) is a type of incarnation, avatar, of Lord Krishna. "Whenever the Lord is present in someone by portions of His various potencies, the living entity representing the Lord is called a śaktyāveśa-avatāra — that is, an incarnation invested with special power." Unlike other avatars which are amsas, expansions, or amsaamsa, expansions of expansions of the Lord Himself, a shaktyavesh avatar is when the Lord empowers a living entity, jiva, with the potency of God Himself.
Shakti means Power; Avesha means endowed; Avatar means one who descends from the spiritual realm, incarnation.
The following description of the various types of avatars is given in the ancient Garga Samhita.
It is stated in the Śrī Caitanya Caritāmṛta Madhya 20.246
and also in that same chapter it is stated: