The story
- Sanskrit · calque ofतथाता
- Old English · inherited fromswilċnes“quality”
- Middle English · inherited fromswichnesse“the quality or nature of a thing”
- English todaysuchness
From English dialect, from Middle English swichnesse (“the quality or nature of a thing”), from Old English swilċnes (“quality”), equivalent to such + -ness. Reinforced also as a calque of Sanskrit तथाता (tathātā).
Words from the same roots
Etymology from Wiktionary, CC BY-SA 4.0.