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6.5.6 Moving by Defun

Command	Key Binding	Purpose	Curent Value
beginning of defun	‘C-M-a’	Move to beginning of defun
end-of-defun	‘C-M-e’	Move to end of defun
defun-prompt-regexp		User option; what text can
		can appear before the open-paren
		that starts a defun
open-paren-in-columnn-0-is-defun-start		Variable; open paren in col 0 is defun	src_emacs_lisp{open-paren-in-column-0-is-defun-start}
beginning-of-defun-function		Function to find beginning of a defun
end-of-defun-function		Function to find end of defun

The defun commands move to the logical beginning or end of the function point is in. ‘function’ is really a rather loose term.