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refuting or degrading or discrediting or denying something someone else considers to be fact. (HCOB 2 Jun 71 I)
 - any thought, emotion or effort, or counter-thought, counter-emotion or counter-effort which denies or smothers the thought, emotion or effort of the individual. (NOM, p. 56) 
 - invalidation by words is the symbolic level of being struck. (2ACC-19B, 5312CM09) 
 - basically, non-attention. Attention itself is quite important for attention is necessary before an effect can be created. (PAB 8)
 - invalidation is force applied. You apply enough force to anybody and you've invalidated him. How invalidated can he get? Dead! (5207CM24B)
 
Abbr. Inval.