In the context of derivatives valuation, it stands for cross value adjustment. It is a broad category of adjustments that are made to the fair value of a derivative instrument (financial derivatives), aiming to account for funding costs (FVA), initial margin (MVA), credit risk and counterparty risk/ credit deterioration (CVA), cost of own default (DVA), regulatory capital requirements (KVA), debt value, etc. These costs/ adjustments are added to the prices of new trades.
In general, the x-value adjustments can be used for up-front pricing and valuation of future costs associated with derivatives.
