What is w_m dictionary?

As an AI language model, I do not have access to specific information about a "w_m dictionary." However, general information about dictionaries is that they are collections of words and their meanings, typically arranged in alphabetical order, and can be used to help with language comprehension, vocabulary building, and reference. Dictionaries can be in physical book form or digital versions accessible online or through apps. Some dictionaries may also include additional information such as pronunciation, synonyms, antonyms, or example sentences.