The Free On-line Dictionary of Computing (30 December 2018):

Modula-2

    A high-level programming language designed by
   Niklaus Wirth at ETH in 1978.  It is a derivative of
   Pascal with well-defined interfaces between modules, and
   facilities for parallel computation.  Modula-2 was developed
   as the system language for the Lilith workstation.

   The central concept is the module which may be used to
   encapsulate a set of related subprograms and data structures,
   and restrict their visibility from other portions of the
   program.  Each module has a definition part giving the
   interface, and an implementation part.

   The language provides limited single-processor concurrency
   (monitors, coroutines and explicit transfer of control)
   and hardware access (absolute addresses and interrupts).
   It uses name equivalence.

   DEC FTP archive
   (ftp://gatekeeper.dec.com/.1/DEC/Modula-2/m2.tar.Z).

   ["Programming in Modula-2", N. Wirth, Springer 1985].

   (1995-10-25)