Final answer:
Formal diction, as opposed to informal language, should be used when addressing a principal or teacher for professional interactions in school and work environments.
Explanation:
Formal diction should be used when addressing a principal or teacher.
Formal language is more careful and mannered, creating a businesslike distance and reinforcing authority. Informal language, including colloquialism, slang, jargon, idioms, and clichés, is more appropriate for casual conversations.
Maintaining a formal tone in all written correspondence, such as emails, is crucial for ensuring clear and professional interactions in school and work environments.
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