Disturbed or upset, especially mentally. / Insane.

simple past tense and past participle of derange

(transitive, chiefly passive) To cause (someone) to go insane or become deranged. / (transitive) To cause disorder in (something); to distort from its ideal state.

The property of being deranged. / An act or instance of deranging. / (mathematics, combinatorics) A permutation of a set such that no element is in its previous position.

plural of derangement

Third-person singular simple present indicative form of derange

plural of deranger

One who deranges.

present participle of derange

(pathology) One of three mechanical syndromes in the McKenzie method proposed in 1981 by the New Zealand physical therapist Robin McKenzie.