Lucid Intervals
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
In medical jurisprudence. Intervals occurring in the mental life of an insane person during which he is completely restored to the use of his reason or so far restored that he has sufficient intelligence, judgment, and will to enter into contractual relations or perform other legal acts, without disqualification by reason of his discase.
See Insanity.