noun The refusal to accept or comply with something; the attempt to prevent something by action or argument. (she put up no resistance to being led away) The ability not to be affected by something, especially adversely. (some of us have a lower resistance to cold than others) The impeding, slowing, or stopping effect exerted by one material thing on another. (air resistance would need to be reduced by streamlining) The degree to which a substance or device opposes the passage of an electric current, causing energy dissipation. Ohm's law resistance (measured in ohms) is equal to the voltage divided by the current.