What is the meaning of nullified?

verb

• Declare invalid.
  • usage: "The contract was annulled"; "void a plea"
  • synonyms: invalidate, annul, quash, void, avoid, nullify
• Show to be invalid.
  • synonyms: invalidate, nullify
• Make ineffective by counterbalancing the effect of.
  • usage: "Her optimism neutralizes his gloom"; "This action will negate the effect of my efforts"
  • synonyms: neutralize, neutralise, nullify, negate

adjective

• Deprived of legal force.
  • synonyms: invalidated