The definition of a biennium is a period of two years. Your two-year cell phone contract is an example of a biennium. noun.
Symptoms of vestibular neuritis are characterised by a sudden onset of a constant, intense spinning sensation that is usually disabling and requires bed rest. It is often associated with nausea, vomiting, unsteadiness, imbalance, difficulty with vision and the inability to concentrate.
Optic neuritis - Signs and symptoms. 1  Major symptoms are sudden loss of vision (partial or complete), sudden blurred or foggy vision, and pain on movement of the affected eye.