Sentence:  During World War 2 , about 7.5 <WSD>million</WSD> persons were enrolled in courses organized under two special programs administered by state and local school authorities : ( 1 ) Vocational Education for National Defense , and ( 2 ) War Production Training . 
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