Hypertension, or high blood pressure, is a condition in which blood-pressure at rest is higher than the body's needs. Because hypertension lacks overt symptoms, high blood pressure can go unnoticed for years.
2. metric-a decimal unit of measurement of the metric system (based on meters and kilograms and seconds); convert all the measurements to metric units; it is easier to work in metric. metric unit.
Kilometer is a metric length unit and equals to 1000 meters. It is spelled as kilometre in europe. It is a commonly used unit of length in most of the countries to measure the distance between two geographical locations. The abbreviation is km.