invalidate
Cross references: 1. nullify in.val.i.date \(')in-'val-*-.da-t\ \(.)in-.val-*-'da--sh*n\ \in-'val-*-.da-t-*r\ vt : to make invalid; esp : to weaken or destroy the cogency of - in.val.i.da.tion n
Cross references: 1. nullify in.val.i.date \(')in-'val-*-.da-t\ \(.)in-.val-*-'da--sh*n\ \in-'val-*-.da-t-*r\ vt : to make invalid; esp : to weaken or destroy the cogency of - in.val.i.da.tion n