Thereof is used after a noun to relate that noun to a situation or thing that you have just mentioned.
[formal]
...his belief in God–or the lack thereof.
...a charge of £5 per hour or part thereof.
thereof in British English
(ˌðɛərˈɒv)
adverb formal
1.
of or concerning that or it
2.
from or because of that
thereof in American English
(ðɛrˈʌv)
adverb
1.
of that
2.
concerning that
3.
from that as a cause, reason, etc.; therefrom
Examples of 'thereof' in a sentence
thereof
Growth - or lack thereof.
Times, Sunday Times (2016)
We are going to turn our attention to summer accessories and our lack thereof.
Times, Sunday Times (2010)
Will the election come down to a tie, or a lack thereof?
Times, Sunday Times (2008)
But what really stood out was his understanding of his death, or rather lack thereof.
Christianity Today (2000)
The absolute limit of appropriation lies rather in men themselves, in their religious capacity for understanding or the lack thereof.
Greeley, Andrew M. Sociology and Religion: A Collection of Readings (1995)
I mention women in film, or the lack thereof.
Times, Sunday Times (2014)
Or, rather, the lack thereof.
Times, Sunday Times (2007)
Item: whales - or the lack thereof.
Oxenhorn, Harvey Tuning the Rig: A Journey to the Arctic (1990)
And then there's abdominal muscle tone, or lack thereof.
Times, Sunday Times (2015)
And to have an impact, the idea must be transmitted throughout society, or at least throughout a significant part thereof.
Henry, John F The Making of Neoclassical Economics (1990)
Can you find anything in these three theories or combinations thereof that can account for the decline of the Methodists and the increase of the Baptists?
Greeley, Andrew M. Sociology and Religion: A Collection of Readings (1995)