mark-to-market noun 1mark to market verb 1forms 5 noun[before a noun]1 •Assigning a value to an asset equal to the current market price of the asset or one calculated based on related standardised assets for which there is a market.Mark-to-market is the calculation that shows your unrealized P&L based on where you could close your open positions in the market at that instant. — 2011 mark to market verb1 •To value an asset at its current actual or estimated market price. formsmarked to market · marking to market · marks to market · mark to markets · mark-to-markets