(uncountable) The quality of being constant; steadiness or faithfulness in action, affections, purpose, etc. / (countable) An unchanging quality or characteristic of a person or thing.

A female given name from Latin. / A surname.

plural of constancy

A lake on the Rhine located at the intersection of Germany (Bavaria and Baden-Württemberg), Switzerland (St. Gallen, Thurgau and Schaffhausen) and Austria (Vorarlberg); it consists of two parts, the Obersee in the east and northwest (Überlinger See) and the much smaller Untersee in the west.