I have heard that a word like "I" is considered a word but why? is every other letter considered a word too?
I have used Grammarly and Microsoft word to write and noticed that every single letter(alone) is considered as a word but based on the definition of oxford dictionaries a word is "a single distinct meaningful element of speech or writing, used with others (or sometimes alone) to form a sentence and typically shown with a space on either side when written or printed." so why are they considered as a word?