Plain English Meaning
A short glossary that tells you what specific words mean in this part of the book, so you read them the way the FAA intends.
Full Definition
A reference section in an FAA handbook that lists the specialized vocabulary used in that chapter or publication, along with the meaning each word carries in that aviation context.
Context Anchor
Seen as a chapter or section heading in FAA handbooks before the material uses words that need a clear, shared meaning.
Derivation
Term comes from a Latin word meaning a boundary or limit. Definition comes from a Latin word meaning to set limits or make something definite. Together, they point to the same idea: setting the exact meaning of a word so it is not left vague.
Why Pilots Care
Aviation uses everyday words with very specific technical meanings. Reading a chapter without first checking its terms and definitions is a common cause of confusion later in the material.