1. To make void; render invalid. 2. Remove the validity or force of (a treaty, contract, etc.) 3. Invalidation by words is the symbolic level of being struck. 4. A psychological technique used to minimize, intimidate, dominate, suppress, or subordinate one person to another. Criticism is often used to this end. 5. The act of minimizing, judging, shaming, dismissing, ignoring, or rejecting someone’s ideas, thoughts, feelings, or behaviors.