CC Ādi 1.77

svarūpam anyākāraṁ yat
tasya bhāti vilāsataḥ
prāyeṇātma-samaṁ śaktyā
sa vilāso nigadyate
Synonyms: 
sva-rūpam — the Lord’s own form; anya — other; ākāram — features of the body; yat — which; tasya — His; bhāti — appears; vilāsataḥ — from particular pastimes; prāyena — almost; ātma-samam — self-similar; śaktyā — by His potency; saḥ — that; vilāsaḥ — the vilāsa (pastime) form; nigadyate — is called.
Translation: 
“When the Lord displays numerous forms with different features by His inconceivable potency, such forms are called vilāsa-vigrahas.”
Purport: 

This is another quotation from the Laghu-bhāgavatāmṛta (1.15).