entomology, pathology 1. the probability that a tree or stand will be attacked by, or incur an outbreak of, an insect or pathogen —see immunity, resistance 2. the suitability of a habitat for an insect or pathogen or for populations of insects or pathogens 3. the inability to avoid or withstand attack by a parasite, usually a matter of degree —see hazard, tolerance This definition last updated 10/23/2008