Slippage is the gap between expected and filled price. On order books it reflects walking the book; on AMMs it is a deterministic function of pool reserves and trade size (price impact).
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Slippage / Price Impact
Difference between expected price and executed price; impact moves the book.
Impact rises with trade size / depth
Related terms
Liquidity Depth / AMM constant product
How much size a pool can absorb; constant-product AMMs use x·y=k.
Impermanent Loss
Temporary divergence in value when providing liquidity vs holding the assets.