Sentence:  Statistically , the <WSD>most</WSD> significant data have been collected from the sensors on 1958 Alpha ( Explorer 1 , ) , 1958 Delta 2 ( Sputnik 3 , ) , and 1959 Eta ( Vanguard 3 , ) . 
Meaning of the word marked with <WSD> tags:  used to form the superlative