Definition of CGI in English:

CGI

noun

  • [mass 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.

Pronunciation:

CGI

/siːdʒiːˈʌɪ/