1. [n]  act of assisting or making easier the progress or improvement of something
2. [n]  (neurophysiology) phenomenon that occurs when two or more neural impulses that alone are not enough to trigger a response in a neuron combine to trigger an action potential
3. [n]  the condition of being made easy (or easier); "social facilitation is an adaptive condition"

FACILITATION is a 12 letter word that starts with F.