Thus means in this way, and so. Thus far, thus it was, and thus we conclude.
It is formal and slightly old-fashioned, and in most writing so or therefore does the job better. Thus far means up to now. It is one of the oldest words in the language and has barely changed shape in a thousand years.
1adverbthusIn this way; and so.
“He was the oldest son and thus the heir to the family business.”
thus is a manner.
Old English thus means in this way, from a Germanic root. It has kept its shape for over a thousand years.
Proto-West Germanic
*þus — so, thus
Old English
þus — thus, in this way, as follows, in this manner, to this extent
Middle English
thus
English, today
thus
From Middle English thus, þus, from Old English þus (“thus, in this way, as follows, in this manner, to this extent”), from Proto-West Germanic þus (“so, thus”), perhaps originally from a variant of the instrumental form of this, related to Old English þȳs (“by this, with this”), Old Saxon thius (“by this, with this”). Cognate with Scots thus (“thus”), frr aldoz, stq dus, düs (“thus”), West Frisian dus (“thus”), Dutch dus (“thus, so”), Middle High German dus (“thus, as follows”). Compare also Dutch zus (“thus, hence”), Low German sus (“thus, hence”), Middle High German sus (“thus, hence”), a similar formation from the stem of *swā.
Etymology from Wiktionary, CC BY-SA