What does the word "concat" actually or originally mean?

Recently I am reading a copy of source code from somewhere written in Java.

There's a statement of a method likes:

public static <T> List<T> concat(List<T>... lists){
     ...
 }
 

and I wonder that whether it's suitable to name it "concat"? Originally, what does the word "concat" mean? Does it mean "CONnect ChAracTer" or other?

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