the combination of the likelihood of an event and the severity of the potential consequences. In the context of trees. risk is the likelihood of a conflict or tree failure occurring and affecting a target. and the severity of the associated consequences-personal injury. property damage. or disruption of activities.

Merriam-Webster Online Dictionary
risk (noun)
possibility of loss or injury - peril
someone or something that creates or suggests a hazard
a) the chance of loss or the perils to the subject matter of an insurance contract , also the degree of probability of such loss
b) a person or thing that is a specified hazard to an insurer
c) an insurance hazard from a specified cause or source - war risk
the chance that an investment (as a stock or commodity) will lose value
risk (verb)
transitive verb
to expose to hazard or danger - risked her life
to incur the risk or danger of - risked breaking his neck
risk (Wikipedia)

Risk is the possibility of 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 (planned or not planned). Risk can also be defined as the intentional interaction with uncertainty. Uncertainty is a potential, unpredictable, and uncontrollable outcome; risk is an aspect 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 endeavour carries some risk, but some are much riskier than others.

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