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 third way measurement abbreviations are often formed is by using the first letter of each word (mph/miles per hour) or major part of the word. When a prefix is added to a basic metric unit, the word is abbreviated by using the first letter of the prefix and the first letter of the basic unit.