CEO /ˌsiː iː ˈəʊ $ -ˈoʊ/ noun [countable]
(Chief Executive Officer) the person with the most authority in a large company

[TahlilGaran] Dictionary of Contemporary English ▲

CEO
Chief Executive Officer
My uncle was the CEO of a large computer company.

[TahlilGaran] English Idioms Dictionary ▲

c.e.o.
n. Abbreviation of "Chief Executive Officer." The head of a company, factory, firm, etc.
We are very proud of the fact that our C.E.O. is a young woman.

[TahlilGaran] English Idioms Dictionary ▲

CEO
Chief Executive Officer 
Christmas and Easter Only (church attendance)

[TahlilGaran] Acronyms and Abbreviations Dictionary ▲