lispdoc - results for defvar

(defvar var &optional (val nil valp) (doc nil docp))
Function: Define a special variable at top level. Declare the variable SPECIAL and, optionally, initialize it. If the variable already has a value, the old value is not clobbered. The third argument is an optional documentation string for the variable.
 Mentioned in:
CLtL2 - 23.4. Loading Files
CLtL2 - 25.1.3. Compilation Environment
CLtL2 - 5.2.2. Lambda-Expressions
CLtL2 - 5.3.2. Declaring Global Variables and Named Constants
CLtL2 - 9.1. Declaration Syntax
CLtL2 - 9.2. Declaration Specifiers
HyperSpec - Macro DEFPARAMETER, DEFVAR
On Lisp - Adding Prolog Features
On Lisp - An Interpreter
On Lisp - Common Lisp Evolves
On Lisp - Compiling Networks
On Lisp - Free Symbol Capture
On Lisp - Functions as Representation
On Lisp - The Process Abstraction
PCL - constants
PCL - dynamic aka special variables
PCL - filing cds
PCL - other ways to modify places
PCL - package gotchas
PCL - the heart of a spam filter
PCL - the mighty loop
PCL - the pretty printer backend
PCL - three standard packages
PCL - training the filter
Successful Lisp - chapter10
Successful Lisp - chapter28
Successful Lisp - global vars and consts