(US, education) 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.

A proof designed to monitor the progress of printing, similar to an artist's proof.

(mathematics) The relation of three quantities in harmonic progression, with the second being a harmonic mean between the first and third, as in the three numbers 2, 3, and 6.

plural of proof leaf

(obsolete) A proof sheet (page of proofed text)

(space science, British spelling) A programme of space exploration and research.

(firearms) A mark stamped on a gun to show that it has been tested successfully.

plural of proof mark

A kind of theology developed from process philosophy, and according to which it is an essential attribute of God to affect and be affected by temporal processes, rather than being eternal and immutable.

plural of process theology