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.
The metric unit system is easy to handle because everything is a multiple or a fraction of ten. There is a base unit for each type of measurement, such as meter (abbreviation m) for length, gramm (abbreviation g or gr) for weight or liter (abbreviation l or lt) for volume. Ten base units have the prefix deka (which is however rarely used), for example 1 dekameter (Dm) equals to 10 meters.