Up to now; so far — used adverbially to indicate the state or practice that has continued until a given point.
従来はこの方法が標準だったが、新しい方法が広まりつつある。
This method was standard until now, but a new method is spreading.
従来の研究ではこの点が見落とされていた。
This point was overlooked in previous research.
従来は手作業で行っていたが、自動化された。
It used to be done manually, but it has been automated.
Traditional/conventional/existing — used to modify nouns (as in '従来の〜') to mean the traditional or previously existing way or item.
従来の製品では対応できない問題が出てきた。
Problems have arisen that conventional products cannot handle.
従来のやり方を見直して、新しい方針を決めた。
We reviewed the conventional methods and decided on a new policy.