Isolated and insulated both come from Latin insula, island.
The Latin word insulatus, made into an island, became isolato in Italian and both insulated and isolated in English.
The two English words have different meanings:
Isolated means separated or set apart from others. You can be in a remote place without contact with anybody. Even with a lot of people around you at a party, you can feel isolated when you feel as if nobody notices you or makes contact with you.
You can also isolate something, identify, for example, a problem, in order to deal with it.
And scientists can isolate a virus from an infected host.
Insulated is used to indicate that something is covered or wrapped in a material that protects from loss of heat, an electric shock, etc.
Without being isolated, children that grow up with overprotective parents may be insulated against and unprepared for the harsh realities of life.
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.
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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