I have no idea about the official reason, but outside of certain 
programming languages that use "array" for one-dimensional data structures, 
an array often has two (or more) dimensions.  In R, for example, arrays can 
have an arbitrary number of dimensions.  Honestly, when I'm away from Java 
for a while and then encounter the term "array" in Java, I have to stop and 
remember that it's 1-D, or check some documentation, because "array" 
doesn't automatically mean 1-D to me.

On the other hand, I believe that vectors are always one-dimensional, as in 
linear algebra.

So maybe Rich Hickey just decided that "vector" was a better, less 
ambiguous name.

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