The best graphic organizer to use to better understand a definition passage is

Venn diagram.

Explanation:

A Venn diagram assists in presenting the data in a graphic form and this would help in comparing and contrasting the ideas, events or characters reflected in the passage. It gives a visual form to the information and provides a source for brainstorming and understanding the data or message given in the message more effectively. It is employed for thinking as well as an assessment tool as it enlaces a more concise form to the passage and assists in examining the thinking abilities of the students.

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