What is sciatica? Sciatica is pain, tingling, or numbness produced by an irritation of the nerve roots that lead to the sciatic nerve. The sciatic nerve is formed by the nerve roots coming out of the spinal cord into the lower back. It goes down through the buttock, then its branches extend down the back of the leg to the ankle and foot.
Definition of navigable - (of a waterway or sea) able to be sailed on by ships or boats, (of a website) easy to move around in Definition of navigable - (of a waterway or sea) able to be sailed on by ships or boats, (of a website) easy to move around in
Freebase(0.00 / 0 votes)Rate this definition: Navigation. Navigation is a field of study that focuses on the process of monitoring and controlling the movement of a craft or vehicle from one place to another. The field of navigation includes four general categories: land navigation, marine navigation, aeronautic navigation, and space navigation.