Sentence:  On the other hand , the new authority of $ 3825 million proposed for missile procurement ( excluding research and construction ) in 1961 is $ 581 <WSD>million</WSD> higher than for 1960 . 
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