The answer is MONTHLY The corresponding square is ATLANTIC by Roger Barkan and Brian Tivol Reading down, the first letters in each column read "Merriam", "Webster", and "web site". If you visit that web site (http://www.m-w.com) and look up each of the words, you may notice that the definitions each have one (non-trivial) word in common. They are: mixture, ornamental, number, table, hypothetical, lively, youth. Taking the first letters of this new set of seven words gives the answer: MONTHLY.