| Term | Definition |
| polyhedron | A solid bounded by plane faces, especially by more than four. |
| polysyllable | Having several syllables, especially more than three syllables. |
| polytechnic | Pertaining to, embracing, or practicing many arts. |
| polytheism | The doctrine or belief that there are more gods than one. |
| pommel | To beat with something thick or bulky. |
| pomposity | The quality of being marked by an assumed stateliness and impressiveness of manner. |
| pompous | Marked by an assumed stateliness and impressiveness of manner. |
| ponder | To meditate or reflect upon. |
| ponderous | Unusually weighty or forcible. |
| pontiff | The Pope. |
| populace | The common people. |
| populous | Containing many inhabitants, especially in proportion to the territory. |
| portend | To indicate as being about to happen, especially by previous signs. |
| portent | Anything that indicates what is to happen. |
| portfolio | A portable case for holding writing-materials, drawings, etc. |
| posit | To present in an orderly manner. |
| position | The manner in which a thing is placed. |
| positive | Free from doubt or hesitation. |
| posse | A force of men. |
| possess | To own. |
| possession | The having, holding, or detention of property in one's power or command. |
| possessive | Pertaining to the having, holding, or detention of property in one's power or command. |
| possessor | One who owns, enjoys, or controls anything, as property. |
| possible | Being not beyond the reach of power natural, moral, or supernatural. |
| postdate | To make the date of any writing later than the real date. |
| posterior | The hinder part. |
| postgraduate | Pertaining to studies that are pursued after receiving a degree. |
| postscript | Something added to a letter after the writer's signature. |
| potency | Power. |
| potent | Physically powerful. |
| potentate | One possessed of great power or sway. |
| potential | Anything that may be possible. |
| potion | A dose of liquid medicine. |
| powerless | Impotent. |
| practicable | Feasible. |
| prate | To talk about vainly or foolishly. |
| prattle | To utter in simple or childish talk. |
| preamble | A statement introductory to and explanatory of what follows. |
| precarious | Perilous. |
| precaution | A provision made in advance for some possible emergency or danger. |
| precede | To happen first. |
| precedence | Priority in place, time, or rank. |
| precedent | An instance that may serve as a guide or basis for a rule. |
| precedential | Of the nature of an instance that may serve as a guide or basis for a rule. |
| precession | The act of going forward. |
| precipice | A high and very steep or approximately vertical cliff. |
| precipitant | Moving onward quickly and heedlessly. |
| precipitate | To force forward prematurely. |
| precise | Exact. |
| precision | Accuracy of limitation, definition, or adjustment. |