ENGLISH
REFERENCE

thereby

adv. sent.
C1 Advanced Oxford US //ˈðɛɹˈbaɪ// UK //ðeəbˈaɪ// there·by Academic Formal

adv. as a result of a specific action. You use it to show that one thing happened because of another thing you just mentioned.

adv. by that means; as a result of the action or circumstance just described. Functions as a conjunctive adverb to show consequence.


SIMPLE

He saved money every month, thereby allowing him to buy a house.

CONTEXTUAL

The company automated its assembly line, thereby reducing production costs and increasing its profit margins.

COMPLEX

The treaty established a new maritime border, thereby resolving a decades-long territorial dispute that had previously hindered economic cooperation between the two neighboring nations.

Origin

From Middle English therby, from Old English ðǣrbig, equivalent to there + by. Compare the parallel formation of German dabei.

Usage

Typically placed before a present participle (-ing form) to show a direct result of the preceding clause.

Pitfall

He worked hard thereby he succeeded.He worked hard, thereby succeeding.Thereby is an adverb, not a conjunction; it cannot join two independent clauses without a semicolon or by using a participle.

© 2026 English Reference