Welcome to the forum Elaine
I had a bit of a google around the web, as I was interested in the answer to this myself. It seems that as early as 1905 these terms, along with moron, were used to place persons in institutions into classifications. This system is no longer used and the terms are now used in an offensive way, but back then they were considered medical terms.
In simple terms, it seems that under this system that an idiot was one who could not communicate and needed help with everything, whereas an embecile was able to communicate and look after themselves a bit. A moron was one with the disabilty brought on by old age, which might be why some are mentioned noted as 'from birth' - so it was obvious it wasn't due to old age. The first two terms must already have been in use before they became an official term of classification, and moron was added later, just to clarify the condition of the elderly inmates.
I wonder if the institutions enumerators were given a scale to work from in preparing for the census?
Christine


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