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https://www.thoughtco.com/abbreviations-and-acronyms-for-english-learners-1212308?utm_campaign=grammartip&utm_medium=email&utm_source=cn_nl&utm_content=13714091&utm_term=
Any shortened form of a word or phrase is an abbreviation. Acronyms are also a type of abbreviation that can be pronounced as a single word. Abbreviations are selectively used in spoken conversation as well as written English. Generally, common abbreviations such as measurements and titles are always abbreviated in written form.