Definition of variable-area
: being or relating to a motion-picture sound track in which the sounds are represented by an opaque line of varying width that runs parallel to the length of the film
variable-area track
— compare variable-density
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“Variable-area.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/variable-area. Accessed 28 Feb. 2021.
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