Easton's Bible Dictionary
In Matthew 1:17 , the word means a succession or series of persons from the same stock. Matthew 3:7 , "Generation of vipers" = brood of vipers 24:34, "This generation" = the persons then living contemporary with Christ. 1 Peter 2:9 , "A chosen generation" = a chosen people.
The Hebrews seem to have reckoned time by the generation. In the time of Abraham a generation was an hundred years, thus: Genesis 15:16 , "In the fourth generation" = in four hundred years (Compare verse 13 and Exodus 12:40 ). In Deuteronomy 1:35,2:14 a generation is a period of thirty-eight years.
These dictionary topics are from M.G. Easton M.A., D.D., Illustrated Bible Dictionary, Third Edition, published by Thomas Nelson, 1897. Public Domain.
Easton, Matthew George. Entry for 'Generation'. Easton's Bible Dictionary. https://www.studylight.org/dictionaries/eng/ebd/g/generation.html. 1897.