A ‣ Letters or words? 
Most abbreviations are spoken as individual letters.
EU European Union
UN United Nations
PM Prime Minister
MP Member of Parliament
BBC British Broadcasting Corporation
ID identification, e.g. Do you have an ID card?
PC personal computer
CV curriculum vitae[a history of your job experience]
ISP Internet Service Provider
Occasionally abbreviations are spoken as words, e.g. AIDS /eɪdz/ and PIN /pɪn/ [personal identification number, especially used with a bank / credit card]
Language help
We use the verb stand for to ask about the meaning of an abbreviation.
A: What does EU stand for?
B: European Union.
B ‣ Written forms only 
Some abbreviations are written forms only, but pronounced as full words.
Mr Scott (mister Scott)
St Mark’s Church (Saint Mark’s Church)
Mrs Bryant (misses Bryant)
Dean St (Dean Street)
Dr Chapman (doctor Chapman)
C ‣ Abbreviations as part of the language 
Some abbreviations (from Latin) are used as part of the language.
Latin | abbreviation | pronunciation | meaning |
et cetera | etc. | /et ˈsetərə/ | and so on |
exempli gratia | e.g. | /iːˈʤiː/ | for example |
id est | i.e. | /aɪˈiː/ | that’s to say / in other words |
D ‣ Shortened words 
Some common English words can be shortened, especially in spoken English. In some cases, the shorter form is more common and the full form sounds quite formal, e.g. refrigerator, influenza, gymnasium and veterinary surgeon.
phone (telephone)
fridge (refrigerator)
maths (mathematics)
exam (examination)
board (whiteboard/smartboard/blackboard)
plane (aeroplane)
case (suitcase)
photo (photograph)
ad/advert (advertisement)
flu (influenza) [illness like a cold but more serious]
gym (gymnasium)
lab (laboratory)[special room where scientists work]
bike (bicycle)
sales rep (sales representative; syn salesperson)
TV/telly (television)
vet (veterinary surgeon)
paper (newspaper)