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.
A kilometer is a unit of Length or Distance in the Metric System. The symbol for kilometer is km. There are 0.0009144 kilometers in a yard. The International spelling for this unit is kilometre.