Bartlett's Abbreviations is a reference book that contains a collection of abbreviations, acronyms, and initialisms. The two crossword solutions for this term are IBID and ANON. IBID stands for the Latin phrase 'ibidem, ' which means 'in the same place, ' and is used to refer back to a previously cited source. ANON stands for the Latin phrase 'anonymus, ' which means 'UNKNOWN' or 'ANONYMOUS, ' and is used to refer to an author whose name is not known.