For the purposes of this Regulation, the following definitions shall apply:
(a) "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:(i) uncrossing in an auction;(ii) a loss of venue connectivity; (iii) the use of a kill functionality;
(b) "transaction" means a totally or partially executed order;
(c) "volume" means the quantity of financial instruments traded expressed as any of the following:(i) the number of instruments for shares, depositary receipts, ETFs, certificates and other similar financial instruments;(ii) the nominal value for bonds and structured finance products; (iii) the number of lots size or contracts for derivatives;(iv) metric tonnes of carbon dioxide for emission allowances.