Sentence:  Despite the successful rehabilitation of over a half million disabled persons in the first eleven years after 1943 , the existing program was still seen to be inadequate to cope with the nation 's backlog of an estimated two <WSD>million</WSD> disabled . 
Meaning of the word marked with <WSD> tags:  (in Roman numerals, M written with a macron over it) denoting a quantity consisting of 1,000,000 items or units