Webster's English Dictionary

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during

dur.ing \.d(y)u.r-in\ pp [ME, fr. prp. of duren to last, fr. OF durer, fr. 
   L durare to] harden, endure, fr. durus hard; perh. akin to Skt a-ru wood - 
   more at TREE 1: throughout the duration of {swims every day ~ the summer}  
   2: at a point in the course of : IN {takes his vacation ~  July}