firstletter
nounUK /ˈfɜːstˌletə/
US /ˈfɜːrstˌletər/
The first letter is the letter that comes at the start of a word.
The first letter of 'apple' is 'a'.
OTHER MEANINGS
2. The first letter of a person's name, often used as an initial.
Please write your first letter and last name on the form.
3. The first letter in a series or list.
Circle the first letter in each row.
4. The opening letter of an alphabet.
In English, the first letter is A.