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26.2 Top-Level Definitions, or Defuns

In Emacs, a major definition at the top level in the buffer, such as a function, is called a defun. The name comes from Lisp, but in Emacs we use it for all languages.

Left Margin Paren:    An open-paren or similar opening delimiter

starts a defun if it is at the left margin.

Moving by Defuns:    Commands to move over or mark a major definition.
Imenu:    Making buffer indexes as menus.
Which Function:    Which Function mode shows which function you are in.