Middle English word lengen comes from Proto-Indo-European *dluh₂gʰó-, Proto-Indo-European *longʰo-, Proto-Indo-European *dl̥h₁gʰós (Long.)
| Dictionary entry | Language | Definition |
|---|---|---|
| *dluh₂gʰó- | Proto-Indo-European (ine-pro) | |
| *longʰo- | Proto-Indo-European (ine-pro) | |
| *dl̥h₁gʰós | Proto-Indo-European (ine-pro) | Long. |
| *langaz | Proto-Germanic (gem-pro) | Long. |
| *langijaną | Proto-Germanic (gem-pro) | To lengthen, make long. |
| lengan | Old English (ang) | |
| lengja | Old Norse (non) | |
| longer | Middle English (enm) |