°The measure of central tendency of a set of values computed by ordering the values and taking the value at position ( + 1) / 2 when is odd or the arithmetic mean of the values at positions / 2 and ( / 2) + 1 when is even.
°The area separating two lanes of opposite-direction traffic in the United States. This area is often covered with vegetation, but also may be covered in concrete and possess traffic accident safety devices such as guardrails.