The library's rare collection included several 18th-century treatises on natural philosophy.

The treatiser spent years revising his arguments before publishing the work.

The treatisers gathered at the symposium to debate the ethical implications of their theories.

She wrote a comprehensive treatise on medieval trade routes that became a standard reference for historians.

The professor recommended a shelf of learned treatises to any student interested in medieval philosophy.

The expert witness cited a learned treatise to support his opinion, and the court admitted it as an exception to the hearsay rule.