Definition of AVAILABILITY. 1. : the quality or state of being available. 2. : an available person or thing.
Definition of EXECUTIVE OFFICER. : the officer second in command of a military or naval organization or vessel. ADVERTISEMENT. the officer second in command of a military or naval organization or vessel. ADVERTISEMENT.
There are executive officer slots in each company, battalion, and brigade, though generally not at higher levels of command until the army level of command. The XO is typically the second-in-command, and serves as the day-to-day manager of the command staff.n executive officer (often abbreviated XO) is generally a person responsible for running an organization, although the exact nature of the role varies depending on the organization. Contents.