| 1 | English | planetary | Of, or relating to planets, or the orbital motion... |
| 2 | English | planet | Each of the seven major bodies which move... |
| 3 | Middle English | planete | Each of the seven celestial bodies which move... |
| 4 | Old French | planete | planet |
| 5 | Latin | planēta | — |
| 6 | Ancient Greek | πλανήτης | wanderer, vagabond; planet; a fever that comes in... |
| 7 | Ancient Greek | -τής | Appended to verbs to form agent nouns |
| 8 | Ancient Greek | πεῖρα | trial, experiment, attempt |
| 9 | Proto-Indo-European | per- | before, in front; first; to go through |
| 10 | Proto-Indo-European | pr̥tós | passed , crossed |