προαίρεσις: free will, reasoned choice, giving or withholding assent to impressions.
προκοπή: progress, on the path towards wisdom.
προκόπτων: Stoic disciple. A person making progress. Even though one has not obtained the wisdom of a sage; when appropriate actions are increasingly chosen, fewer and fewer mistakes will be made, and one will be prokoptôn, making progress.
πρόληψις: preconception possessed by all rational beings.
προσοχή: attitude and practice of attention, mindfulness. State of continuous, vigilant, and unrelenting attentiveness to oneself (prohairesis)