ALL meanings of capital letter
cap·i·tal let·ter
C c - countable noun capital letter Capital letters are the same as capital s. 3
- noun capital letter the form of an alphabetical letter used to begin a sentence or proper name 3
- noun capital letter 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. 1
- noun capital letter alphabet: upper-case 1
- noun capital letter An upper-case letter (A, B, C, ... as opposed to a, b, c, ...), used for emphasis, for starting sentences and proper names, etc. 0