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
Webster's English DictionaryCross 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