Definition - A lower-case letter.

Example -
This a is a minuscule and this A is a majuscule.

Etymology -
The word derives from the Latin minuscula littera, slightly smaller letter (from minusculus, the diminutive of minus, less).

Oxford English Dictionary -
Its first citation is from 1727–41:
"Printers distinguish their letters into capital, majuscule, initial or upper-case letters … and minuscule, small, or under-case letters."
(Chambers Cycl. s.v. Letter )

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