Answer:
1) The definition of technical is in the right picture because technical writing often contains words that are used in specific ways in different disciplines and the definition of operational is on the left picture because its the specific meaning of a word or phrase given to it by the group of people who use the word in their specific context.
2) Definitions are useful in practically any field,
Definitions are useful in practically any field,definitions enable us to have a common understanding of a word or subject; they allow us to all be on the same page when discussing or reading about an issue.