• A way of executing computer code that involves compilation during execution of a program—at run-time—rather than before execution. Most often, this consists of source code or more commonly bytecode translation to machine code, which is then executed directly. A system implementing a JIT compiler typically continuously analyzes the code being executed and identifies parts of the code where the speed-up gained from compilation or recompilation would outweigh the overhead of compiling that code. ← Wikipedia

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