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.
metric (Noun). A measurement of the distance between two points in some metric space: it is a real-valued function d(x,y) between points x and y satisfying the following properties: (1) positive definiteness: and, (2) symmetry: , and (3) triangle inequality: . metric (Verb).
The metric system is a decimal-based system of measurement originally based on the meter and kilogram, which were introduced by France in 1799. Decimal-based means all the units are based on powers of 10. In order to convert between units, it's only necessary to multiply or divide by powers of 10.