| 1 | Middle English | piete | mercifulness, compassion, sympathy |
| 2 | Middle French | pieté | piety |
| 3 | Latin | pietas | Dutiful conduct, sense of duty; Piety,... |
| 4 | Latin | pīus | — |
| 5 | Latin | -tās | — |
| 6 | Proto-Indo-European | -teh₂ts | Used to form nouns representing state of being |
| 7 | Proto-Indo-European | -teh₂ | Used to form nouns representing state of being |
| 8 | Proto-Indo-European | -tós | Creates verbal adjectives from verb stems |