on condition

1. (following by a clause) Providing.
   • 1975, William Russell Bascom, African Dilemma Tales, page 115:

     He was bitten by a snake, but a second woman cured him, on condition that she could also be his wife.

2. (followed by of and, often, a present participle) With the requirement (of).
   • 1793, William Moseley, Lord Peter King, editors, Reports of cases argued and determined in the High Court:

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

   • 1890, J.G. Frazer, The Golden Bough, page 213:

     In all these cases the life of the god-man is prolonged on condition of showing, in a severe physical contest of fight or flight, that his bodily strength is not decayed

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.