Resistance could mean:

• The general ability to stop something from happening (Ex. resistance to water means that the object can avoid being hurt by water)
• Resistance, an ability to reject infection
• Electrical resistance, the repulsion of a current in a circuit
• A struggle against an oppressive government. See also Rebellion
• The Resistance was a fictional military set up by Princess Leia Organa to combat the growing threat of the First Order in the Star Wars universe.