3 files changed, 15 insertions, 15 deletions

diff --git a/lisp/progmodes/gdb-mi.el b/lisp/progmodes/gdb-mi.el
index d243650d73a..978b81699fc 100644
--- a/lisp/progmodes/gdb-mi.el
+++ b/lisp/progmodes/gdb-mi.el
@@ -69,12 +69,12 @@
 ;;   2) Use MinGW GDB instead.
 ;;   3) Use cygwin-mount.el
 
-;;; Mac OSX:
+;;; macOS:
 
-;; GDB in Emacs on Mac OSX works best with FSF GDB as Apple have made
-;; some changes to the version that they include as part of Mac OSX.
-;; This requires GDB version 7.0 or later (estimated release date Aug 2009)
-;; as earlier versions do not compile on Mac OSX.
+;; GDB in Emacs on macOS works best with FSF GDB as Apple have made
+;; some changes to the version that they include as part of macOS.
+;; This requires GDB version 7.0 or later as earlier versions do not
+;; compile on macOS.
 
 ;;; Known Bugs:
 
diff --git a/lisp/progmodes/idlwave.el b/lisp/progmodes/idlwave.el
index 9cb2ca74063..bc607ac4019 100644
--- a/lisp/progmodes/idlwave.el
+++ b/lisp/progmodes/idlwave.el
@@ -420,22 +420,22 @@ A value of t means to show all source files."
   :type 'integer)
 
 (defcustom idlwave-library-path nil
-  "Library path for Windows and MacOS (OS9).  Not needed under UNIX.
+  "Library path for Windows and Mac OS (OS9).  Not needed under UNIX.
 When selecting the directories to scan for IDL user catalog routine
 info, IDLWAVE can, under UNIX, query the shell for the exact search
-path \(the value of !PATH).  However, under Windows and MacOS
-\(pre-OSX), the IDLWAVE shell does not work.  In this case, this
-variable can be set to specify the paths where IDLWAVE can find PRO
-files.  The shell will only be asked for a list of paths when this
-variable is nil.  The value is a list of directories.  A directory
+path (the value of !PATH).  However, under MS-Windows, the
+IDLWAVE shell does not work.  In this case, this variable can be
+set to specify the paths where IDLWAVE can find PRO files.  The
+shell will only be asked for a list of paths when this variable
+is nil.  The value is a list of directories.  A directory
 preceded by a `+' will be searched recursively.  If you set this
-variable on a UNIX system, the shell will not be queried.  See also
-`idlwave-system-directory'."
+variable on a UNIX system, the shell will not be queried.  See
+also `idlwave-system-directory'."
   :group 'idlwave-routine-info
   :type '(repeat (directory)))
 
 (defcustom idlwave-system-directory ""
-  "The IDL system directory for Windows and MacOS.  Not needed under
+  "The IDL system directory for Windows and Mac OS.  Not needed under
 UNIX.  Set this to the value of the `!DIR' system variable in IDL.
 IDLWAVE uses this to find out which of the library routines belong to
 the official system library.  All files inside the `lib' subdirectory
diff --git a/lisp/progmodes/python.el b/lisp/progmodes/python.el
index 3fae3987b22..8ec9febe5c9 100644
--- a/lisp/progmodes/python.el
+++ b/lisp/progmodes/python.el
@@ -2414,7 +2414,7 @@ banner and the initial prompt are received separately."
 (defun python-shell-comint-end-of-output-p (output)
   "Return non-nil if OUTPUT is ends with input prompt."
   (string-match
-   ;; XXX: It seems on OSX an extra carriage return is attached
+   ;; XXX: It seems on macOS an extra carriage return is attached
    ;; at the end of output, this handles that too.
    (concat
     "\r?\n?"