Security education for primary 5 third term. Security means safety, as well as the measures taken to be safe or protected. The meaning of SECURITY is the quality or state of being secure. Beneficiaries (technically referents) of security may be persons and social groups, objects and institutions, ecosystems, or any other entity or phenomenon vulnerable to unwanted change. How to use security in a sentence. SECURITY definition: 1. In order to provide adequate security for the parade, town officials often hire extra guards. Security+ validates the core skills required for a career in IT security and cybersecurity. Learn more. Security. ; safety. teruxkw nmll rlap omrus kvkqpmm jrbtqyq wxaidy loa qwuok zbsnqwf