/del'euh ray"sheuhn/ , n. Archaic.
mental derangement; raving; delirium.
[ 1590-1600; deliration- (s. of deliratio ) folly, equiv. to delir ( are ) to be silly, lit., go out of the furrow ( de- DE- + lir ( a ) furrow + -are inf. ending) + -ation- -ATION ]