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“comprehension”
The act or fact of grasping the meaning, nature, or importance of something and understanding it: The librarian noticed when the students started to smile after her explanation of a topic, that it was a sign of their comprehension and even agreement with what she had said.
(highlights of illustrated historical events for a better comprehension of the historical periods which contributed to the development of the English language)
(The human body is at the edge of human comprehension with its microcosmic mysteries and its 100 trillion cells!)