auxiliary, conjunction
in order to; for the purpose of
Formal/literary conjunction used after the dictionary form of a verb to express purpose. Often seen in written or formal speech.
大学に進学するべく、毎日勉強している。
I study every day in order to enter university.
問題を解決するべく、専門家を招いた。
We invited an expert in order to solve the problem.
auxiliary, conjunction
Archaic/literary auxiliary equivalent to modern べきだ. Used mainly in set phrases or classical-style writing. The form べく is the adverbial form of べし.
驚くべくもないことだが、彼はまた遅刻した。
It is hardly surprising, but he was late again.
Those were words that had to be said.