noun
lowercase letter
Specifically a letter in its lowercase form, as opposed to uppercase (大文字).
See also: 大文字
パスワードには大文字と小文字を混ぜてください。
Please mix uppercase and lowercase letters in your password.
noun
A letter written in a small size, or a letter that is physically small; less common than the lowercase sense.
彼はノートに小文字でびっしりと書いた。
He wrote densely in small letters in his notebook.