on condition that

on condition that idiom
Provided that, with the restriction that, as in She said she'd help with the costumes on condition that she would get ten free tickets to the play. The use of the noun condition in the sense of “stipulation” dates from the late 1300s, and the precise phrase from the early 1500s.

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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