/ˌəʊ.emˈdʒiː/ abbreviation for Oh my God: used when someone is surprised or excited about something: And then, omg, I saw Johnny Depp in Starbucks! SMART Vocabulary: related words and phrases. Expressions of surprise.

For example, places like the Central Intelligence Agency (CIA), Environmental Protection Agency (EPA), World Wildlife Fund (WWF), and National Rifle Association (NRA) are all more commonly known by their abbreviations. When establishing new companies, business owners sometimes use acronyms to come up with a name.

acronym. /ˈæk.rə.nɪm/ us. /ˈæk.rə.nɪm/ an abbreviation consisting of the first letters of each word in the name of something, pronounced as a word: AIDS is an acronym for "Acquired Immune Deficiency Syndrome".