1. The quality of a waterway being piloted or maneuvered: The navigability of some of the large ships on the rivers was no longer good because the rivers had dried out making traveling too dangerous.
2. The suitability of a route or road for vehicles: Jack and Jill studied the map first to see if the navigability was possible for them to travel on with their car.
3. The capability of moving around on a website: Jack found the navigability on one particular internet site quite good, easy, and very usable.