The story
- Ancient Greek · derived fromσυντήρησις“careful watching”
- English todaysynteresis
From Medieval Latin syntērēsis (in Thomas Aquinas), from Ancient Greek συντήρησις (suntḗrēsis, “careful watching”), from συντηρεῖν (suntēreîn, “to keep guard”).
Etymology from Wiktionary, CC BY-SA 4.0.