In accordance with which; by or through which.(conjunction)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "whereby" in a sentence
"“Thou whom our souls do love,” is the title whereby they know him and converse with him,"
"The Duke of York having persuaded himself that she was part of his property, resolved to pursue his claim by the same title whereby his brother had appropriated to himself the favours of Miss Wells; but he did not find her inclined to enter into his service, though she had engaged in that of the duchess."
"Perhaps parents or guardians can shed light to the world we live in whereby cross-promotion, creative licensing and joint ventures are entrepreneur spirit that are not taught in school."