Samuel Johnson English Dictionary

http://johnsonsdictionaryonline.com/

The Samuel Johnson English Dictionary, written in 1755, was the definitive source for English Word definitions at the time. This is a great source for defining the words used in writing the Constitution and Declaration of Independence at the time of the Founders in 1776 & 1787. This way, you can get a better understanding of what certain clauses mean, since definitions change from generation to generation. For instance, “welfare” means something completely different now, than it did in 1787.