Cyber  [sahy-ber] 

A prefix that means “computer” or “computer network,” as in cyberspace, the electronic medium in which online communication takes place. 

Security [si-kyoor-i-tee] 

1. freedom from danger, risk, etc.; safety.

2. freedom from care, anxiety, or doubt; well-founded confidence.

3. something that secures or makes safe; protection; defense.

Cybersecurity (First recorded in 1985–90) 

computing the state of being safe from electronic crime and the measures taken to achieve this