1. The third letter of the English alphabet, or the word used to represent it in radio communication and military contexts.
Usage: often capitalized; used in NATO phonetic alphabet
2. A foolish or incompetent person.
Usage: informal; chiefly British
3. A man or boy; a fellow.
Usage: informal; dated

Examples

• The word 'charlie' represents the letter C in the NATO phonetic alphabet.
• In radio communication, pilots spell out names using 'charlie' for the letter C.
• Don't be such a charlie—you should have known better than that.
• That old charlie down the street always waves at the neighbors.
• The instructor said, 'Charlie, as in the letter C, is the third letter of the alphabet.'