List of Acronyms and Initialisms: O

List Of Acronyms And Initialisms: O

This list contains acronyms, initialisms, and pseudo-blends that begin with the letter O.

For the purposes of this list:

  • acronym = an abbreviation pronounced as a series of constituent letters, e.g., SARS = severe acute respiratory syndrome
  • initialism = an abbreviation pronounced wholly or partly using the names of its constituent letters, e.g., CD = compact disc
  • pseudo-blend = an abbreviation whose extra or omitted letters means that it cannot stand as a true acronym, initialism, or portmanteau (a word formed by combining two or more words).
(a) = acronym in the example: SARS – (a) Severe acute respiratory syndrome
(i) = initialism in the example: CD – (i) Compact disc
(p) = pseudo-blend in the example: UNIFEM – (p) United Nations Development Fund for Women
(s) = symbol (none of the above, representing and pronounced as something else; for example: MHz – Megahertz)

(Main list of acronyms and initialisms)

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