Cygwin
Proper noun
Meaning
Cygwin
(computing) A POSIX-compatible environment that runs natively on Microsoft Windows.
Examples
Cygwin's default user interface is the bash shell running in the Cygwin console.
Cygwin programs are installed by running Cygwin's "setup" program, which downloads the necessary program and feature package files from repositories on the Internet.
Cygwin also recognises NTFS junction points and symbolic links and treats them as POSIX symbolic links, but it does not create them as their semantics are not fully POSIX-compliant.
Cygwin provides a Unix-like environment on Windows, and both Perl and CPAN are available as standard pre-compiled packages in the Cygwin setup program.
Cygwin provides native integration of Windows-based applications, data, and other system resources with applications, software tools, and data of the Unix-like environment.
Cygwin is used heavily for porting many popular pieces of software to the Windows platform.