Definitions

1. noun

A person who proposes or supports a particular doctrine, theory, or system; a proponent.

“The professor was a positor of the new economic theory and presented her research at the conference.”

2. noun

A person who takes a particular position or side, especially in a dispute or argument.

“The lawyer was a positor for the defendant and argued that the charges were unfounded.”

3. verb

To take a particular position or side, especially in a dispute or argument.

“The politician posited himself firmly on the side of the environmental activists.”