Resistance

For an engineer, resistance is an opposition or countering force. For physicians, an immunity. It has multiple meanings in both fields.

Engineering definition

1. Opposition, or counteracting force.
   • (a) The opposition of a conductor to the passage of electricity or other energy or substance, whereby there is a loss of energy and a production of heat; specifically, the potential difference in volts across the conductor per ampere of current flow; unit: ohm.
   • (b) The opposition to flow of a