The act or process of miniaturizing or making smaller(noun)
Something that has been miniaturized or made smaller(noun)
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Use "miniaturization" in a sentence
"Advances in miniaturization and integration of hardware have enabled the design of smart sensor nodes ranging from a square inch to the size of a matchbox."
"And miniaturization is not that important for your purposes."
"Yes we have made great strides in miniaturization, but there are finite limits at some point."