Adverb
Of that or this.
Source: Webster's dictionaryWhereof one cannot speak, thereof one must be silent. Ludwig Wittgenstein
Art is not merely an imitation of the reality of nature, but in truth a metaphysical supplement to the reality of nature, placed alongside thereof for its conquest. Friedrich Nietzsche
That the people have a right to uniform government; and, therefore, that no government separate from, or independent of the government of Virginia, ought to be erected or established within the limits thereof. George Mason
He knows not the law who knows not the reason thereof. American Proverb
Who has, let him thereof take heed; love wanes, misfortune comes with speed. German Proverb
Sufficient for the day is the evil thereof. French Proverb