negation: a negative statement; a statement that is a refusal or denial of some other statement
statement: a message that is stated or declared; a communication (oral or written) setting forth particulars or facts etc
methylenedioxymethamphetamine: a stimulant drug that is chemically related to mescaline and amphetamine and is used illicitly for its euphoric and hallucinogenic effects; it was formerly used in psychotherapy but in 1985 it was declared illegal in the United States