Definition
In the context of physical discomfort during flight training, immunity is the body's reduced sensitivity or resistance to a stressor — such as motion sickness, noise, or fatigue — that develops gradually through repeated, controlled exposure.
Plain English
It is the way the body slowly stops reacting strongly to something unpleasant after being exposed to it enough times. A student who keeps flying short, manageable lessons often stops feeling airsick because their body adapts.
Context Anchor
Seen in discussions of physical discomfort during flight training, especially airsickness or motion sickness.
Derivation
From the Latin immunitas, meaning 'exemption' or 'freedom from.' Originally it referred to being exempt from a duty or burden. In medicine and physiology it came to mean the body's freedom from a reaction it would otherwise have. That same idea carries into flight training: the student becomes 'free from' the discomfort that once affected them.
Why Pilots Care
Instructors must recognize varying tolerance levels so training can be paced appropriately for students without natural resistance.
Intuition Check
Immunity does not mean you are invincible or permanently protected. Here it means resistance to a specific physical reaction, and that resistance may be partial or temporary.
Example Sentence 1
After several short flights in light turbulence, the student began to develop an immunity to motion sickness.
Example Sentence 2
Repeated exposure helped the pilot build immunity to mild turbulence effects.