What does the term "Electronic Cash" stand for in computer science lingo?
Digital cash is supposed to be a digital equivalent to our legacy physical cash (coins and banknotes). 

Therefor digital cash needs to fulfill certain criteria:


payments can be made without a middleman
the receiver has a means of verifying the transaction and be sure that they have been paid
the transaction cannot be reversed


These criteria are met no matter if I hand you a banknote or send you a Bitcoin transaction. They also create privacy and non-confiscatability as no middlemen carry out the transaction for you or hold your money for you.