therefore
[adverb]
Synonyms: consequently, accordingly, as a result, ergo, hence, so, then, thence, thus

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Related Words: thence, therefrom

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English Thesaurus: therefore, so, thus, hence, as a result, ...

[TahlilGaran] English Synonym Dictionary ▲

there‧fore S1 W1 /ˈðeəfɔː $ ˈðerfɔːr/ adverb formal
[Date: 1100-1200; Origin: there + for]
as a result of something that has just been mentioned:
Their car was bigger and therefore more comfortable.
Progress so far has been very good. We are, therefore, confident that the work will be completed on time.

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In everyday English, people usually use so rather than therefore:
It was late, so I didn’t stay long.

[TahlilGaran] Dictionary of Contemporary English ▲

therefore
adverb
1.
BAD: She has lived in New York for many years therefore she regards New York as her home.
GOOD: She has lived in New York for many years and (therefore) regards New York as her home.

Usage Note:
Therefore is an adverb (NOT a conjunction). It cannot be used to link clauses.
See also HOWEVER (however), NEVERTHELESS (nevertheless)

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2.
DUBIOUS: The child looked lost and therefore I asked him if I could help.
GOOD: The child looked lost and so I asked him if I could help.

Usage Note:
Therefore is used mainly in formal styles: 'Crops have been badly affected by the drought and therefore food will be in short supply.'
In non-formal styles use so : 'It was quite late so I didn't stay long.'

[TahlilGaran] Dictionary of Common Errors ▲

therefore for this reason:
She already had a lot of experience and therefore seemed the best candidate for the job.
so therefore. So is less formal than therefore, and is more common in everyday English:
They had not eaten all day, so they were very hungry.
thus formal as a result of what you have just mentioned:
The program is very simple and thus easy to run.
hence formal for this reason:
This material is highly poisonous, hence the importance of careful handling.
as a result used when saying that because of a particular situation, something else happens or is true:
Some people suffer from stress at work and become ill as a result.
Economic growth slowed down as a result of inflation.
consequently/as a consequence used when saying that because of a particular situation, something else happens or is true. Consequently and as a consequence are more formal than as a result:
The disease attacks the plant, the flower does not open, and consequently no seeds are produced.
As a consequence of global warming, our climate is already starting to change.
this means that used when saying what the result of something is:
If students arrive late, this means that lesson time is wasted.
for this reason used when explaining the reason for something:
Spell check programs do not recognize when you have used the wrong word. For this reason, you must still read over your work carefully.

[TahlilGaran] English Thesaurus ▲