2.  the opposition offered by one thing, force, etc., to another.

 

3.  Electricity .
     a.  Also called ohmic resistance. a property of a conductor by virtue of which  the passage of current  is opposed, causing electric energy to be transformed into heat: equal to the voltage across the conductor divided by the current flowing in the conductor: usually measured in ohms. Abbreviation:   R
     b.  a conductor or coil offering such opposition; resistor .

 

4.  Psychiatry . opposition to an attempt to bring repressed thoughts or feelings into consciousness.

 

5.  ( often initial capital letter ) an underground organization  composed of groups of private individuals working as an opposition force in a conquered country to overthrow the occupying power, usually by acts of sabotage, guerrilla warfare, etc.: the resistance during the German occupation in World War II.

 

6.  Stock Exchange . resistance level.