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

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

In the context of "Letters to the Editor," the term "Editor" refers to the first definition you mentioned. It means the person who is in charge of a newspaper or magazine, or a specific section of it, and is responsible for deciding what should be included in it. The editor determines which articles, stories, opinions, and other content are published and shapes the overall content and tone of the publication. In the case of "Letters to the Editor," the editor is responsible for selecting and publishing letters from readers that are of interest or relevance to the publication's audience.