- plainFlat, level.
- plenaryFully attended by a plenum; for everyone's attendance.
- replenishTo refill; to renew; to supply again or to add a fresh quantity to.
- plenalfull; complete
- pleneWith matres lectionis (letters indicating vowels) written out.
- pleniloquenceExcessive or overly full speech.
- plenipotentHaving full power.
- plenismThe belief that all space is full of matter; horror vacui
- plenistA believer in plenism; someone who believes that all space is full of matter.
- plenopticOf or relating to all the light, travelling in every direction, in a given space.