olemus
üks juhirolle töökorralduses,
sisu sõltub õigusruumist ja organisatsioonist

Wiktionary:
(business) the highest-ranking corporate officer or executive officer of a corporation, company, or agency, responsible for carrying out the policies of the board of directors on a day-to-day basis

ülevaateid
https://en.wikipedia.org/wiki/Chief_executive_officer