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)
For other uses, see Risk (disambiguation).

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.

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