Hmm, maybe you'd find “parameters” (not to be confused with function
parameters) useful for your goals.
#lang racket
(define current_meaning (make-parameter "some string"))
(define (display_current_meaning)
(display (current_meaning)))
(display_current_meaning)
(let ()
(parameterize ([current_meaning "a different string"])
(display_current_meaning)))
(display_current_meaning)
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