• (a.) To make void; to render invalid; to deprive of legal force or efficacy. • (a.) To make void; to render invalid; to deprive of legal force or efficacy. Found on http://thinkexist.com/dictionary/meaning/nullify/
Nul'li·fy transitive verb [ imperfect & past participle Nullified ; present participle & verbal noun Nullifying .] [ Latin nullificare ; nullus none + -ficare (in comp.) to make. See Null , Found on http://www.encyclo.co.uk/webster/N/40