a letter of the alphabet that usually differs from its corresponding lowercase letter in form and height, as A, B, Q, and R as distinguished from a, b, q, and r: used as the initial letter of a proper name, the first word of a sentence, etc.
Capital vs. CapitolCapital and capitol are both commonly used in political contexts and are separated by just one letter, making them frustratingly easy to confuse. When it comes to these two terms, it’s important to note that one has a number of meanings while the other refers to a certain type of building. Capital has many definitions. It can mean “the wealth owned or employed in business …
Also called capital.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for capital letter
If the capital-letter be retained where a prefix is put to a proper name, the hyphen is obviously necessary."Stops"|Paul Allardyce
Word Origin and History for capital letter
late 14c.; see capital (adj.). So called because it is at the "head" of a sentence or word.
Online Etymology Dictionary, © 2010 Douglas Harper