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Gforth Manual

5.12 Compiling words

In contrast to most other languages, Forth has no strict boundary between compilation and run-time. E.g., you can run arbitrary code between defining words (or for computing data used by defining words like constant). Moreover, Immediate (see section 5.10 Interpretation and Compilation Semantics and [...] (see below) allow running arbitrary code while compiling a colon definition (exception: you must not allot dictionary space).

5.12.1 Literals		Compiling data values
5.12.2 Macros		Compiling words