Risk is the potential of gaining or losing something of value. Values (such as physical health, social status, emotional well-being or financial wealth) can be gained or lost when taking risk resulting from a given action or inaction, foreseen or unforeseen. Risk can also be defined as the intentional interaction with uncertainty. Uncertainty is a potential, unpredictable, and uncontrollable outcome; risk is a consequence of action taken in spite of uncertainty.
Risk perception is the subjective judgment people make about the severity and probability of a risk, and may vary person to person. Any human endeavor carries some risk, but some are much riskier than others.
The Oxford English Dictionary cites the earliest use of the word in English (in the spelling of risque from its Arabic original "رزق" ) which mean working to gain income gain and profit (see Wikipedia Arabic meaning ) as of 1621, and the spelling as risk from 1655. It defines risk as:
Risk is an uncertain event or condition that, if it occurs, has an effect on at least one [project] objective. (This definition, using project terminology, is easily made universal by removing references to projects).