What does "adjunct professor" mean?

A college professor who is employed part-time or for a limited time, is junior to a full professor, or is otherwise not eligible for tenure.

What is a synonym for "adjunct professor"?

Common synonyms include: adjunct, adjuncts.

noun

noun ·Rare ·Advanced level

Noun

1
A college professor who is employed part-time or for a limited time, is junior to a full professor, or is otherwise not eligible for tenure. US