The story
- Proto-Indo-European*ten-
- Proto-Indo-European*tend-
- Proto-Indo-European*téndeti
- Proto-Italic*tendō
- Latintendō
- Latintendēns
- Medieval Latintendentia
- English todaytendency
From Medieval Latin tendentia, from tendēns, present participle of tendō.
Etymology from Wiktionary, CC BY-SA 4.0.