Pedi means feet and hundreds of years ago, the word impediment referred to shackling one's feet. Now its use has broadened considerably. Impediment is something that blocks or impedes your path.
Freebase(0.00 / 0 votes)Rate this definition: Commissary. A commissary is someone delegated by a superior to execute a duty or an office; in a formal, legal context, one who has received power from a legitimate superior authority to pass judgment in a certain cause or to take information concerning it.
Report Abuse. The prison commissary is a place where the inmates could buy snacks, probably health and hygiene products (toothpaste, shampoo, etc.), possibly postage stamps, writing paper, etc. Anything that would be required for day-to-day living but not harmful or dangerous to themselves or others.