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 kilometre (International spelling as used by the International Bureau of Weights and Measures; SI symbol: km; / Ë k Éª l É m iË t Ér / or / k Éª Ë l É m Éª t Ér /) or kilometer (American spelling) is a unit of length in the metric system, equal to one thousand metres (kilo-being the SI prefix for 1000).