| Noun | 1. | newsletter - report or open letter giving informal or confidential news of interest to a special groupnews report, write up, report, account, story - a short account of the news; "the report of his speech"; "the story was on the 11 o'clock news"; "the account of his speech that was given on the evening news made the governor furious" market letter - a newsletter written by an analyst of the stock market and sold to subscribers | |