letter
nounUK /ˈlet.ər/
US /ˈlet̬.ɚ/
A letter is a written mark that stands for a sound in words.
The word 'cat' starts with the letter C.
OTHER MEANINGS
2. A letter is a message you write and send to someone.
She wrote a letter to her grandmother.
3. Letters are the written symbols of an alphabet.
He learned all the letters of the alphabet.
4. A letter can mean the exact words of a law or rule.
They followed the letter of the law.