what is cil in c#
Top Definition. CIL. Common Intermediate Language (formerly known as MSIL, or Microsoft Intermediate Language) is a low-level assembly-type programming language using the .NET-platform. It is the language into which high-level .NET-languages such as C#, Visual Basic.NET, J# and F# are compiled.ommon Intermediate Language (formerly known as MSIL, or Microsoft Intermediate Language) is a low-level assembly-type programming language using the .NET-platform.