In the same way, for the same reason. For example, He has a good ear for music, and by the same token he finds it easy to pronounce foreign words. This phrase today is used in a general way to connect statements that have some logical association with one another. [Mid-1400s]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.