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Definition: JIT compilation


(Just-In-Time compilation) Compiling bytecode just before execution. A JIT compiler converts bytecode into native machine code just before the program is run each and every time. Bytecode is already a pre-compiled intermediate code that is used most notably in Java and Microsoft's .NET platforms. Compiled code resides in memory until the application is closed. See bytecode, Java compiler, .NET framework and AOT compilation.