Abbreviations, Acronyms, and Initialisms Abbreviations are shortened forms of words.  Ex: Mister = Mr.  Ex: Mistress = Mrs.  Ex: Avenue = Ave. Ex: Apartment = Apt.  Acronyms are a kind of abbreviation. They are usually formed with the first letters, or the first parts of several words, and form a new word.  Ex: NASA = National Aeronautics and Space Administration …

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