| 1 | Middle English | onnesse | oneness, unity; concord, harmony; similarity |
| 2 | Old English | ānnes | oneness, unity, agreement, covenant, solitude |
| 3 | Old English | -nes | Used to form abstract nouns, usually from... |
| 4 | Proto-West Germanic | -nassī | Used to form abstract nouns, usually from... |
| 5 | Proto-Germanic | -inassuz | -ness |
| 6 | Proto-West Germanic | -ī | -ness, -th |
| 7 | Proto-Germanic | -į̄ | -th |
| 8 | Proto-Indo-European | -íh₂ | — |
| 9 | Proto-Indo-European | -h₂ | Creates collective nouns, which refer to groups... |