'Hence' is common in formal logic and mathematics to show a conclusion. It connects premises with a final step or answer clearly and formally.
All humans are mortal, hence Socrates is mortal.
If A equals B, hence B equals A.
'Hence' can mean 'from this time'. It is used to say how much time will pass from now or another time. This use is more formal or old-fashioned.
We will leave five days hence.
He said that months hence, he will return.
Used rarely, 'hence' means 'from this place'. It can describe movement or origin starting here or from this source. This meaning is mostly found in literature or formal texts.
The river flows hence to the sea.
Goods come hence by ship.
It is used to connect a result or conclusion to previous information. It signals that what follows is the consequence of what was just mentioned.
He failed the test; hence, he must study.
Prices are high; hence, sales dropped.
This meaning marks a specific time interval counted from now or a time mentioned. It is formal and less used in everyday speech but common in legal or old texts.
Three weeks hence, we celebrate.
Events two hours hence will start.
