Plain English Meaning
The drive to become the best version of yourself by using your abilities to the fullest. It is what motivates people once their basic needs are met and they want to grow, achieve, and find personal meaning in what they do.
Full Definition
In Maslow's hierarchy of needs, the highest level of human motivation, in which a person seeks to realize their full potential, pursue personal growth, and become the most they are capable of being. It is reached only after lower needs (physical, safety, social, and esteem) have been reasonably satisfied.
Context Anchor
Seen in aviation instructor discussions of student motivation, especially when explaining why a student may be driven by mastery, purpose, or long-term aviation goals.
Derivation
From 'self' (one's own person) and 'actualize,' which comes from the Latin 'actus' meaning 'a doing' or 'act.' To actualize something is to make it real or bring it into action. Self-actualization, then, is the act of making your full potential real.