Just as internet-savvy young people nowadays use fancy abbreviations such as 2Y2 (to you too), CU L8ER (see you later) and TNX (thanks), people in the 1830s also made up funny abbreviations, often based on intended misspellings. They could, for example, write KY for know yuse, meaning no use. All right was abbreviated OW (oll wright). OK was such a misspelling, supposed to mean oll korrect. It became popular when it first appeared in print in the Boston Morning Post in 1839.

In 1840, President Martin van Buren campaigned for reelection, and his supporters chose O.K. as the motto for the campaign. Van Buren’s nickname was Old Kinderhook, and supporters formed O.K. Clubs around the country. In the end, van Buren was not okayed by the voters; his opponent William Henry Harrison won the election.

OK became increasingly popular and is used all over the world in various versions such as okeh, okie, okej, okey, ookoo, owkej, hokay and others.

You can write OK in different ways, with and without full stops and in uppercase or lowercase letters. If you write for a journal, you should consult its style guide. OK is also written okay, and in student slang it became okey-dokey or okie-dokie.

Space people at NASA added a letter; AOK means All OK.

The initialism has its own sign: to signal OK, you form a circle with your thumb and first finger with the other fingers pointing upwards.

You should, however, be cautious about using this OK sign in certain countries, where it might be vulgar or offensive. In Brazil, for example, it is the equivalent of giving someone the middle finger (up yours!). The sign has also become linked to white supremacist groups in the USA.

There have been alternative suggestions about the origin of OK. One theory says that the abbreviation is from the Choctaw language (the Choctaws are a Native American people in the southeastern United States). An example of folk etymology is the belief that OK comes from the Scottish och aye, meaning oh yes. Another explanation points out that the letters OK were stamped on biscuits given to soldiers in the American Civil War. The biscuits came from Orrin Kendall’s bakery. But the most probable explanation is the one from the Boston Morning Post.

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While an acronym is formed from a phrase, a backronym (or bacronym) is a word that is supposed to come from a phrase, but that phrase has been constructed (often humorously) to fit an existing word.

A well-known example of a backronym is posh, meaning stylish, elegant, upper-class. There is a popular belief that posh came from ’port out, starboard home’. It was thought that rich people would book two cabins on their voyage to India and back home, one on the port side of the ship and the other on the starboard. In that way they made sure that they could travel more comfortably, away from the heat of the sun. However, posh was quite simply a slang word in the late 1800s for an overdressed dandy. Another meaning of posh was a small coin, money. 

Another backronym is golf, which is – erroneously – said to come from gentlemen only, ladies forbidden. The word golf is considered to come from Middle Dutch cold, meaning stick or club.

A few more backronyms:

A CAPTCHA is a distorted code you copy on a website to access a page. This is to prevent automated attacks on a website. The acronym is said to mean Completely automated public Turing test to tell computers and humans apart. However, the word is most likely a contrived acronym, in other words, a backronym. It was probably made in analogy with gotcha, ’I have got you’, meaning that you have caught somebody doing something wrong. A gotcha also means a sudden unexpected problem. The interesting thing is that there now is another way to prevent hackers from accessing a web page – and it is called GOTCHA, said to mean Generating panOptic Turing Tests to Tell Computers and Humans Apart. If you don’t know Alan Turing or the Turing Test, read here or here.

The Morse signal SOS is said to mean Save our Ship or Save our Souls. In fact, the alarm signal is …- – -… (three short, three long, three short without any pause), while the letters SOS in Morse code are three short, pause, three long, pause, three short.

Another distress signal is Mayday, mainly used by airplane or ship crews. It is used in voice communication via radio. In a life-threatening emergency the word is repeated three times. The word is said to have been created by Frederick Rockford, a radio officer at Croydon Airport in London in 1923. Mayday supposedly comes from the French m’aidez meaning ‘help me’ or venez m’aider meaning ‘come and help me’. So Mayday is not a backronym.

Neither is May Day, which is something completely different. It refers to the first of May (or the first Monday in May) being a festival in many countries to celebrate the arrival of spring.

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Some words created as acronyms have become so common that people do not know they are acronyms. Some examples:

There are other abbreviations formed by the first letter of each word, but they are pronounced as individual letters. These abbreviations are called initialisms. Some examples:

The most common initialism is probably OK. It is such a popular abbreviation that it deserves its own blog post.

Communicating on the internet has created many abbreviations:

How the first letter in an abbreviation is pronounced determines whether the indefinite article should be written a or an. Compare the following:

In my next blog post you can read about backronyms.

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Many abbreviations are formed by leaving out all except the first few letters of a word. These abbreviations often end with a full stop.

Names of the months are abbreviated according to this general principle of just shortening words.

There is more variation in how the days of the week are abbreviated.

Many abbreviations leave out letters in the middle of a word and end with the last letter of the word. Here are some examples:

Some titles also follow this principle:

You can read more about titles here.

Geographical names are often abbreviated:

Names of the states in the USA are abbreviated to two uppercase letters. You can find them here. The capital Washington is in the District of Columbia, abbreviated DC.

Abbreviations can also become words in their own right and we no longer realise that they are abbreviations.

Hankie (or hanky) is short for handkerchief.

The American colloquialism nabe comes from neighborhood.

Pram is short for perambulator, a carriage for a baby.

Soccer is an abbreviation of association football, which is different from American football.

In American English abbreviations are usually followed by a full stop. In British English this generally applies to abbreviations that are formed by the first letter or the first few letters of a word as in the first table above.

There are many Latin abbreviations in the English language, which you can read about here and here.

Acronyms and initialisms are also abbreviations. Read about them here.

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How you can begin a letter or an email

If you know the name of the recipient, use the title and the surname after the word Dear.

Dear Ms O’Connor,
Dear Mr Harding,
Dear Dr Johnson,
Dear Professor Green,

Using the abbreviated form Prof may seem less respectful, and the full form is recommended.

As mentioned here, there is usually a period (a full stop) after abbreviated titles in American English. In American English the salutation is usually followed by a colon instead of a comma.

If a person’s name does not reveal whether it is a man or a woman and you are not sure, write the full name:

Dear Kim Nelson,
Dear Taylor Smith,

Don’t know the name?

If you do not know the name of the person you are writing to, try to find it out. Check the website of the journal, university, department, organisation, company, etc., under ”Staff”, ”About us” or ”Contact us”. You might also find out a person’s name on LinkedIn. Another option would be to call the office and ask for the name.

If you cannot find the name but know the person’s function, you can write, for example,

Dear Editor,
Dear Librarian,
Dear Recruiting Manager,
Dear Chief Technology Officer,
Dear Communications Director,
Dear President of Sales,
Dear Social Media Specialist,
Dear Research Assistant,
Dear Supervisor,

If you know neither the name nor the function of the person you are writing to, write

Dear Sir/Madam, and if you know the recipient is a man (woman), write Dear Sir, (Dear Madam,). If there are more than one recipient, you can write Dear Sirs,.

Some writers use the phrase

To whom it may concern, (in American English To Whom It May Concern),

but that may seem too impersonal.

Ending a letter or an email

To end a formal letter to a person whose name you know, write

Yours sincerely, (mainly British usage)
Sincerely yours, (mainly American usage)

If you do not know the name of the recipient, write

Yours faithfully, (British English)
Yours truly, (American English)

Slightly less formal endings would be

With best regards,
With kindest regards,

And more informal:

Regards,
Kind regards,
Best regards,

These last examples would be suitable in an email, since emails are seen as less formal than letters.

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The following are some Latin abbreviations used in English:

You can use sic to indicate a mistake in a cited text to show that the mistake was in the original text and is not yours. It is usually put inside square brackets: [sic]

The following are capitalised:

Even if Latin words often are italicised in English text, you should write their abbreviations in normal font.

Read more about e.g. and i.e. and about et al.

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When referring to literature, the abbreviation is used to replace author or editor names when there are more than two (in some cases more than three) authors or editors:

Simon et al. (2000) showed the importance of R&D for production.
This has been pointed out in previous research (e.g., Eriksson et al., 2016; Palm et al., 2016; Platts et al., 1996).

Make sure you put the full stop in the right place! The word et is not abbreviated but alia is, so the full stop must be after al.

When you write et al., the verb must of course have its plural form:
Simon et al. (2000) have pointed out that …

In the possessive form, et al. is followed by an apostrophe and an s:
Simon et al.’s (2000) contribution to research …

Latin words are sometimes italicised in English text, but abbreviations should not be in italics, unless the publisher requires it.

You will find some common Latin abbreviations in English here.

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e.g. stands for exempli gratia, which means for example.
Use e.g. when you want to list one or more examples of something you have mentioned.

Our products are sold in several European countries, e.g. France, Germany, Italy and Greece.

Since you want to give examples, don’t write a complete list.

i.e. stands for id est, which is Latin for that is or in other words.
Use i.e. to clarify or explain something.

I am a linguist, i.e. I study languages.

In writing, e.g. and i.e. are lowercase. There should be a full stop after each letter, and the abbreviations should be preceded by a comma. In American English there should also be a comma after the abbreviation; British English usually does not have this comma. Instead of a comma before the abbreviation you can have a dash.

Latin words are often italicized in English texts, but when abbreviated they should be written in normal font.

The two abbreviations can, of course, be written out in full: for example and that is or that is to say. You should avoid beginning a sentence with an abbreviation.

To sum up, e.g. opens up some possibilities, i.e. narrows them down.

You will find more Latin abbreviations in English here.

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