Results 1 to 2 of 2
  1. Unregistered

    Rules for period usage

    Why do some abbreviations require a period, such as M.D. and others do not, such as CIA?

  2. Snowcake's Avatar
    Senior Member
    • Member Info
      • Native Language:
      • German
      • Home Country:
      • Germany
      • Current Location:
      • Germany

    • Join Date: Mar 2008
    • Posts: 624

    Re: Rules for period usage

    See here:


    This might help you as well:

    Full stops/Periods in abbreviations: Americans tend to write Mr., Mrs., St., Dr. etc., while British will most often write Mr, Mrs, St, Dr, etc., following the rule that a full stop is used only when the last letter of the abbreviation is not the last letter of the complete word; this kind of abbreviation is known as a contraction in the UK. Many British writers would tend to write other abbreviations without a full stop, such as Prof, etc, eg, and so on (so recommended by some Oxford dictionaries). However, the "American" usage of periods after most abbreviations is also widely used in the UK. In either case, it is incorrect to put a stop / period after unit symbols such as kg or Hz; however, in non-scientific contexts, the unit for "inch" is often written in., as it would be ambiguous without the period.


    Hope this helps

Similar Threads

  1. The Pronunciation Rules and The Writing System
    By M.Mozaffary in forum Pronunciation and Phonetics
    Replies: 9
    Last Post: 03-Mar-2009, 23:27
  2. There's vs there are
    By besthost in forum Ask a Teacher
    Replies: 14
    Last Post: 24-Oct-2007, 07:05
  3. Re: Usage of certain very common words
    By Dinesh Boudh in forum Ask a Teacher
    Replies: 1
    Last Post: 07-Jun-2007, 21:23
  4. usage and use
    By jiang in forum Ask a Teacher
    Replies: 7
    Last Post: 12-Apr-2004, 04:27


Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts