Probability of adverse effects caused under specified circumstances by an agent in an organism, a population, or an ecological system.
Expected frequency of occurrence of a harmful event arising from such an exposure.
Source: PAC, 2004, 76, 1033. 'Glossary of terms used in toxicokinetics (IUPAC Recommendations 2003)' on page 1069 (https://doi.org/10.1351/pac200476051033)