cir·cum·fu·sion \ˌ ̷ ̷ ̷ ̷+ˈfyüzhən\noun (-s) Etymology: Late Latin circumfusion-, circumfusio, from Latin circumfusus + -ion-, -io -ion : the act of circumfusing or state of being circumfused < the circumfusion of the smoke > < the circumfusion of the island by fog >