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From The Free On-line Dictionary of Computing (05 January 2017) [foldoc]:
local variable
A variable with lexical scope, i.e. one
which only exists in some particular part of the {source
code}, typically within a block or a function or
procedure body. This contrasts with a global variable,
which is defined throughout the whole program.
Code is easier to understand and modify when the scope of
variables is as small as possible because it is easier to see
how the variable is set and used. Code containing global
variables is harder to modify because its behaviour may depend
on and affect other sections of code that refer to that
variable.
(2009-12-14)