A base or basis: the foundation, starting point, or basic ingredient of something.
彼の理論は長年の研究をベースにしている。
His theory is based on years of research.
このソースはトマトをベースに作られている。
This sauce is made with tomatoes as the base.
デザインのベースを決めてから詳細を詰めよう。
Let's decide the design base first and then work out the details.
A base such as a military base or depot: a location serving as a headquarters or supply center.
部隊は海外のベースに派遣された。
The unit was dispatched to an overseas base.
補給ベースは港の近くに設置された。
The supply base was set up near the port.
A base in baseball: the bases (bags) that players run to (first, second, third, home).
走者は二つのベースを盗んだ。
The runner stole two bases.
彼はフォースアウトでベースを踏んだ。
He stepped on the base for a force out.