@code{defun} defines a symbol as a function, creating a lambda
expression and storing it in the function cell of the symbol. This
lambda expression thus becomes the function definition of the symbol.
-(The term ``function definition'', meaning the contents of the function
+(The term ``function definition,'' meaning the contents of the function
cell, is derived from the idea that @code{defun} gives the symbol its
definition as a function.) @code{defsubst} and @code{defalias} are two
other ways of defining a function. @xref{Functions}.