risk

noun

1.
a source of danger; a possibility of incurring loss or misfortune
harm's way endangerment hazard jeopardy peril
Derived from:
risk risky
2.
a venture undertaken without regard to possible loss or injury
danger peril
Derived from:
risk risky
3.
the probability of becoming infected given that exposure to an infectious agent has occurred
risk of infection
4.
the probability of being exposed to an infectious agent
risk of exposure