Definitions

1. proper noun

a male given name, especially as a nickname for Charles.

“My friend Charlie is a great guy to have around.”

2. noun

a term for an unknown or unidentified military aircraft or missile, especially one detected by radar.

“The air force scrambled to identify the Charlie on the radar screen.”

3. noun

a term in the NATO phonetic alphabet, representing the letter C.

“Charlie, Charlie, this is Alpha. We are ready to proceed.”