Definition of by letter
- We communicated with each other by letter.
- a relationship that began by letter
: a symbol usually written or printed representing a speech sound and constituting a unit of an alphabet
: a direct or personal written or printed message addressed to a person or organization
: a written communication containing a grant
: to set down in letters : print
: to mark with letters
: to win an athletic letter
: one that rents or leases
What made you want to look up by letter? Please tell us where you read or heard it (including the quote, if possible).