re·sis·tance (rĭ-zĭsˈtəns)

1. The capacity of an organism to defend itself against a disease.
2. The capacity of an organism, a tissue, or a cell to withstand the effects of a harmful physical or environmental agent.
3. The opposition of a body or substance to current passing through it, resulting in a change of electrical energy into heat or another form of energy.
4. In psychoanalysis, a process in which the ego opposes the conscious recall of repressed unpleasant experiences.