Definition of CGI in US English:

CGI

noun

  • Computer-generated imagery (special visual effects created using computer software)

    ‘fewer real stunts are performed because filmmakers can just use CGI’
    as modifier ‘it's a mixture of live action and CGI animation’

Computing
  • Common gateway interface (a script standard for writing interactive programs generated by visitors to web pages).

Pronunciation

CGI

/siːdʒiːˈaɪ/