To deal with or discuss a particular subject, especially in a book or formal text.
To be about a topic, especially in a book or speech.
One main meaning — here's how to use it.
To have a particular subject as its theme or content, used of a text or discourse.
"The second volume treats of the philosophical implications of the discovery."
This book treats of the nature of the soul and its immortality.
Largely archaic; found mainly in older literature and formal academic writing. Modern speakers would almost always use 'deal with', 'be about', or 'discuss' instead. Rarely used in contemporary speech.
Natural word combinations native speakers use most often.
The five tense forms you'll use most often.
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