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The following is a sequence of definitions for cybersecurity and cyberspace as provided in known glossaries.

Cybersecurity is the ability to protect or defend the use of cyberspace from cyber attacks [CNSSI 4009].

Cybersecurity is the ability to protect or defend the use of cyberspace from cyber attacks [NISTIR 7298r2].

Cybersecurity is the activity or process, ability or capability, or state whereby information and communication systems and the information contained therein are protected from and/or defended against damage, unauthorized use or modification, or exploitation [NICCS 2016].

Cyberspace is a global domain within the information environment consisting of interdependent IT infrastructures, telecommunication networks and computer processing systems, and embedded processors and controllers [CNSSI 4009].

Cyberspace is a global domain within the information environment consisting of interdependent IT infrastructures, telecommunication networks and computer processing systems, and embedded processors and controllers [NISTIR 7298r2].

Cyberspace is the interdependent network of IT infrastructure that includes the Internet, telecommunication networks, computer systems, and embedded processors and controllers [NICCS 2016].

As shown above, we found identical definitions for both terms in these glossaries [CNSSI 4009], [NISTIR 7298r2] and a similar definition for cyberspace in the glossary [NICCS 2016]. While these terms are not defined in [ISO/IEC 27000], [RFC 4949]], the International Telecommunication Union approved the overview of cybersecurity as described in [ITU‐T 2008], which is not really a concise definition.

In common usage, the term cyberspace refers also to the virtual environment of information and interactions between people [WH 2009]. However, a new term, cyber ecosystem, is encompassing more entities. It is defined as the interconnected information infrastructure of interactions among persons, processes, data, and information and communication technologies, along with the environment and conditions that influence those interactions [NICCS 2016].