| planar | (adjective) involving or having two dimensions | Synonyms: two-dimensional |
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| planate | (adjective) having been flattened | Synonyms: flattened |
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| plane | (adjective) having a surface without slope, tilt in which no part is higher or lower than another | Synonyms: flat, level |
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| planetal | (adjective) of or relating to or resembling the physical or orbital characteristics of a planet or the planets | Synonyms: planetary |
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| planetary | (adjective) of or relating to or resembling the physical or orbital characteristics of a planet or the planets | Synonyms: planetal |
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| (adjective) of or relating to or characteristic of the planet Earth or its inhabitants | Synonyms: terrestrial |
| (adjective) involving the entire earth; not limited or provincial in scope | Synonyms: global, world-wide, world, worldwide |
| (adjective) having no fixed course | Synonyms: erratic, wandering |
| plangent | (adjective) loud and resounding | - |
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| planktonic | (adjective) of or relating to plankton | - |
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| planless | (adjective) aimlessly drifting | Synonyms: adrift, afloat, aimless, directionless, rudderless, undirected |
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| planned | (adjective) designed or carried out according to a plan | - |
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| (adjective) with planning and intention | Synonyms: aforethought, plotted |
| planoconcave | (adjective) flat on one side and concave on the other | - |
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| planoconvex | (adjective) flat on one side and convex on the other | - |
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| planographic | (adjective) of or relating to or involving planography | - |
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| plantal | (adjective) of or relating to plants | - |
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| plantar | (adjective) relating to or occurring on the undersurface of the foot | - |
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| planted | (adjective) set in the soil for growth | - |
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| (adjective) (used especially of ideas or principles) deeply rooted; firmly fixed or held | Synonyms: deep-rooted, deep-seated, implanted, ingrained |
| plantigrade | (adjective) (of mammals) walking on the whole sole of the foot (as rabbits, raccoons, bears, and humans do) | - |
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