on condition

Prepositional phrase

followed by of and often

(following by a clause) Providing. / (followed by of and, often, a present participle) With the requirement (of).

Japanese Meaning

〜という条件で / 条件付きで / 条件として

You can borrow my car on condition that you fill the tank before returning it.

車は、返却する前にガソリンを満タンにするという条件で貸してあげます。

Sense（1）

(following by a clause) Providing.

Sense（2）

(followed by of and, often, a present participle) With the requirement (of).

these presents are made in contemplation, but not on condition of, a marriage

Sense（3）

(operations, maintenance) When testing or inspection finds an indication of a potential problem.

Airframes, engines, and electronics are generally repaired on condition, before next flight.