interposition

noun

Etymology: From Middle English interposicion, from Old French interposicion, from Latin interpositio.

1. The act of interposing, or the state of being interposed; a being, placing, or coming between; mediation.

   “[…] a Scuffle immediately ensued, which might have produced Mischief, had it not been prevented by the Interposition of Thwackum and the Physician […]”

   ““True, true,” cried Mr. Knightley, with most ready interposition—“very true […]””

2. The thing interposed.