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.
executive agency (an agency of the executive branch of government). Chief Executive; President; President of the United States; United States President (the person who holds the office of head of state of the United States government).