( x "<spaces>name" -- )
Skip leading space delimiters. Parse name delimited by
a space. Create a definition for name with the execution
semantics defined below, with an initial value equal to x.
name is referred to as a "value".
( -- x )
Place x on the stack. The value of x is that
given when name was created, until the phrase xTOname is executed, causing a new value of
x to be assigned to name.