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Facilitated diffusion. Definition. noun. Transport of substances across a biological membrane from an area of higher concentration to an area of lower concentration by means of a carrier molecule. Since the substances move along the direction of their concentration gradients, energy is not required.
Answers. Relevance. Rating Newest Oldest. Best Answer: Facilitated diffusion is a type of passive transport (does not require energy) that allows molecules to move across the cell membrane with the help of transport proteins. Only certain types of molecules can bond to the transport proteins.eport Abuse. Facilitated diffusion (also known as facilitated transport or passive-mediated transport) is a process of passive transport (as opposed to active transport), with this passive transport aided by integral membrane proteins.