CEO

This term carries a connotation of ultimate authority and accountability within a corporate hierarchy. It suggests a role focused on high-level strategy and public representation rather than day-to-day tactical execution. While often used interchangeably with president or managing director in casual conversation, it specifically denotes the top of the executive chain.

As a countable noun, it follows standard English pluralization rules. It is typically used with a definite article when referring to a specific company's leader or an indefinite article when discussing the role in general.