| 1. | an act or instance of slipping. |
| 2. | an amount or extent of slipping. |
| 3. | failure to maintain an expected level, fulfill a goal, meet a deadline, etc.; loss, decline, or delay; a falling off. |
| 4. | Machinery. the amount of work dissipated by slipping of parts, excess play, etc. |
Slippage
The difference between estimated transaction costs and the amount actually paid.
Investopedia Commentary
Slippage is usually attributed to a change in the spread.
Related Links
Backtesting: Interpreting the Past
Vertical Bull and Bear Credit Spreads
See also: Spread, Transaction Costs