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 based on units of 10, with standard prefixes attached to the basic unit of measurement. In this case, the basic unit is the meter. The prefix milli- means one thousandth, centi- means one hundredth, deci- means one tenth and kilo- means one thousand.