It partly depends what you mean by electronic dictionary, but the Collins dictionary, published in 1979, was one of the first published that used a computer database of definitions which made it much easier to prevent circular definitions.
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glen whipple
By 1935, Takayanagi had invented the first all-electronic television.
There are many purposes of an electronic dictionary. The main purpose of an electronic dictionary is to provide web users with the meanings of certain words and phrases.
pascal
E-Dictionary
The first modern dictionary is often credited to Samuel Johnson, who published "A Dictionary of the English Language" in 1755. This dictionary was a significant milestone in the standardization of the English language.
schulyer wheeler
it was invented in 1908 by Alva J. Fisher.
Charles Babbage invented the first electronic computer