For the purposes of this Regulation, the following definitions shall apply:
‘order’ includes all input messages, including messages on submission, modification and cancellation sent to the trading system of a trading venue, relating to an order or a quote, but excluding cancellation messages sent subsequent to:
uncrossing in an auction;
a loss of venue connectivity;
the use of a kill functionality;
‘transaction’ means a totally or partially executed order;
‘volume’ means the quantity of financial instruments traded expressed as any of the following:
the number of instruments for shares, depositary receipts, ETFs, certificates and other similar financial instruments;
the nominal value for bonds and structured finance products;
the number of lots size or contracts for derivatives;
metric tonnes of carbon dioxide for emission allowances.