whereby

1. (interrogative, obsolete) By what, in which direction; how.Examples: "Whereby goest thou?"interrogativenot-comparableobsolete

2. (nonstandard) Where, wherein, in which.Examples: "Because COBOL does not have a date type, some implementations rely instead on a system whereby all dates are coded to a reference point. The most commonly used is May 20, 1875, as this was the date of an international standards-setting conference held in Paris, known as the Convention du Mètre."nonstandardnot-comparable