| Term | Definition |
| polyarchy | rule by many; government having three or more rulers |
| polychromatic | having a variety of colors; multicolored; variegated |
| polygamy | marriage to several people at the same time |
| polyglot (adj.) | speaking several languages |
| polyglot (noun) | person who speaks several languages |
| polygon | closed plane figure having, literally, many angles and therefore many sides |
| polymorphic | having various forms |
| polyphonic | having many sounds or voices |
| polysyllabic | having more than three syllables |
| polytechnic | dealing with many applied sciences and technical arts |
| polytheism | belief that there is a plurality of gods |