Something described as minuscule is very small. Minuscule can also mean "written in, or in the size or style of, lowercase letters," in which case it can be contrasted with majuscular.

// The number of bugs in the latest version of the video game is minuscule compared to the number that surfaced in the beta version.

// The ancient manuscripts on display are all in minuscule script.

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"Resembling a stout field mouse, B. brevicauda is a tiny burrowing mammal with inconspicuous ears and minuscule eyes well hidden behind a long narrow snout." — Bill Schutt, Bite: An Incisive History of Teeth, from Hagfish to Humans, 2024

Minuscule comes from the Latin adjective minusculus ("somewhat smaller" or "fairly small"), which in turn pairs the base of minus ("smaller") with -culus, a diminutive suffix (that is, one indicating small size). The minuscule spelling is consistent with the word’s etymology, but that didn’t stop English speakers from adopting the variant spelling miniscule, likely because they associated it with the combining form mini- and such words as minimal and minimum. Usage commentators generally consider the miniscule spelling an error, but it is widely used in reputable and carefully edited publications, and is accepted as a legitimate variant in some dictionaries. (Our own dictionary identifies miniscule as a "disputed spelling variant.")