The story
- Proto-Indo-European*ten-
- Proto-Indo-European*tend-
- Proto-Indo-European*téndeti
- Proto-Italic*tendō
- Latintendō
- Latintēnsiō
- Middle Frenchtension
- English todaytension
Borrowed from Middle French tension, from Latin tēnsiō.
Etymology from Wiktionary, CC BY-SA 4.0.