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I see these:
1. Mr; Mrs - BrE
2. Mr.; Mrs. - AmE
3. AM; PM - BrE
4. A.M.; P.M. - AmE
I wonder if the same applies to the following:
assn; adj; adv; Apr
In the UK, is it more common to do without the
abbreviation point in such cases?
Thank you.
1 2
Comments  
I have never noticed a difference between BrE and AmE, but perhaps there is one.

One rule I learned, that is certainly not universally observed, is that a full stop is not needed if the last letter of the abbreviation is the same as the last letter of the word abbreviated.

It is interesting that Mr and Mrs are never written as full words when followed by someone's name.
BrE
(1) Strictly speaking, all such abbreviations require a full stop (to show that they are abbreviations).
(2) However, when an abbreviation is very frequently used, the full stop is often omitted, as in Mr and Mrs. Another example of this omission is in a modern Language Learners Dictionary, where the abbreviations adv. adj. n. v. etc. are everywhere, so you may find that the full stop is omitted.
Date abbreviations such as "Apr" are also so frequently used that the full stop is consequently usually omitted when it is part of a longer date form e.g. 12th Apr 2005, or in a list of dates.
(3) With a.m. and p.m. it is the same. The full stops are needed, but if you can get away with leaving them out, and the reader knows what you mean, you could omit them.
(4) In some situations it is also a matter of accepted style. In correspondence, since about the 1980's, when writing the name and address of the recipient and sender, both on the envelope and in the correspondence itself, the use of full stops after a person's initials, and the comma at the end of the address lines, has gradually been discontinued, and has now largely been dropped in the UK, particularly in business correspondence.
(5) When sending text msgs via yr mobile (cell phone), dnt incld fll stps aftr yr abbrvs, bcz evry1 wl h8 U 4 it!
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(2) However, when an abbreviation is very frequently used, the full stop is often omitted, as in Mr and Mrs.

American English a period i.e. full stop is used after Mr., Mrs., Ms. regardless of frequency of use.
Thank you very much, everybody, for the valuable information as always.
This information is incorrect.

One uses an abbreviation point only when the word is shortened, that is, when it is abbreviated.

Mr. is a shortened form of Mister, and Mrs. is a shortened form of Missus. Regardless of frequency, these words are always abbreviated (an abbreviation point is always used).

Ms was created in the 60s when some women began to desire a way to hide thier marital status (sometimes professionally, sometimes personally). It is not "short for" anything; thus, it is not an abbreviation, and no abbreviation point is ever used following this word.
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This is an old thread. I think some of the information above is incorrect. Many style guides nowadays recommend dropping the period for Mr, Mrs, am, pm, etc.
Yes, this is an old thread, and yes there are differences between BrE and AmE.

I would consider it incorrect to drop the period after Mr. or Mrs. on an American document.

While the style 7 PM is okay without the periods, 7 am without them is not generally accepted in any American style guide.
I see. Thanks Barbara. Yes, the style guides I read are mostly for British publishers.

The examples in the Style Guide of BBC, the Economist and the Guardian are Mr without the dot.
The Chicago Manual of Style and US Govt Printing Office use Mr. with the dot.
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