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A word is a sequence of arbitrary characters (expcept white space). Words are separated by white space. E.g., each of the following lines contains exactly one word:


A frequent beginner's error is to leave away necessary white space, resulting in an error like Undefined word; so if you see such an error, check if you have put spaces wherever necessary.

." hello, world" \ correct
."hello, world"  \ gives an "Undefined word" error

Gforth and most other Forth systems ignore differences in case (they are case-insensitive), i.e., word is the same as Word. If your system is case-sensitive, you may have to type all the examples given here in upper case.