layman

noun5

1. •
   Someone who is not a professional in a given field.

   • Carmen is not a professional anthropologist, but strictly a layman.
   • Let me explain it to you in layman's terms.
2. •
   A common person.
3. •
   A person who is untrained or lacks knowledge of a subject.

   • should he be held to be just a layman, or does he have some art? — 2005
4. •
   Layperson, someone who is not an ordained cleric or member of the clergy.
5. •
   Lay-sister or lay-brother, person received into a convent of monks, following the vows, but not being member of the order.