1. the quality or state of being instructive; the capacity to teach, inform, or provide useful knowledge or guidance
Usage: uncountable noun; formal register

Examples

• The instructiveness of the documentary made it valuable for classroom use.
• Teachers appreciate the instructiveness of well-designed textbooks.
• The instructiveness of her presentation helped the audience understand the complex topic.
• We valued the instructiveness of the workshop over its entertainment factor.
• The instructiveness of historical case studies lies in their practical lessons.
• The book's instructiveness was enhanced by clear examples and diagrams.