in the context of Jean Piaget's theory of cognitive development, negation is the process where an individual realises a process can always be negated, or otherwise reversed, inverted etc.

NEGATION: "When an individual realises that a procedure or process can be reversed, they are said to have realised the concept of negation."
Cite this page: N., Pam M.S., "NEGATION," in, April 7, 2013, (accessed July 27, 2021).