'Slippage' definitions:

Definition of 'slippage'

(from WordNet)
noun
A decrease of transmitted power in a mechanical system caused by slipping
noun
Decline from a standard level of performance or achievement
noun
Failing to hold or slipping out of place; "the knots allowed no slippage"

Definition of 'Slippage'

From: GCIDE
  • Slippage \Slip"page\, n. The act of slipping; also, the amount of slipping. [1913 Webster]