commonoath
nounUK /ˈkɒmən əʊθ/
US /ˈkɑːmən oʊθ/
A promise that many people make together.
The villagers took a commonoath to keep the river clean.
OTHER MEANINGS
2. A set of words everyone says when swearing to do something.
The new members recited the commonoath at the ceremony.
3. A promise that is usual and well known to all.
Saying thank you is a commonoath of good manners.
4. An old term for a public pledge made by a town.
The town's commonoath was written on the old stone wall.