Question

Letters to the Editor
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What does 'Editor" mean here?

The dictionary definition is as follows.
Does "Editor" in the example phrase above mean #1 or #2?

1. the person who is in charge of a newspaper or magazine, or part of a newspaper or magazine, and decides what should be included in it
editor of
 the editor of the Daily Telegraph

2. someone who prepares a book or article for printing by deciding what to include and checking for any mistakes

Answer 1

It means the first definition, the person in charge of the editorial pages of the newspaper or magazine, or the editor of the publication.