A Matching Engines is a routing a order to the right market for execution.

A Matching Engines is a software system at a (stock) exchange. 

A Matching Engines is matching incoming buy and sell orders to find the best price.

A Matching Engines is a software system of the brokers and dealers to match the right time for execution.

A Matching Engines receives incoming orders via Order Routing Systems.

A Matching Engines receives executes Buy and Sell Orders and leads into a transaction.

A Matching Engines is a software system for finding the right security symbols (ISIN).

An Order Routing System is sending trade instructions (orders) from the Investor to Brokers and Forward to Exchanges.

An Order Routing System is a market data display showing orders live at the exchange.

An Order Routing System is matching Buy and Sell Orders.

An Order Routing System is sending trade instructions (orders) from the Brokers to Investors.

An Order Routing System is an electronic network connecting the banks software system with the broker software system.

An Order Routing System can connect one bank's Front Office with several brokerages, and several markets across different timezones.

An Order Routing System is a system to legally document executed transactions.

A Pricer calculates the Implementation Shortfall (Market Impact) of a transaction for a specific price.

A Pricer is a piece of software which calculates the transaction costs. 

A Pricer is answering electronically answering an RFQ (Request for Quote) automatically.

A Pricer can also be called Pricing Engine.

A Pricer is a piece of software which calculates fair prices of financial instruments mostly based on live market data.

A Pricer is a piece of software in electronic trading which automatically calculated ideal prices of financial instruments.

A Pricer is a piece of software which uses algorithms (simple and complex) to determine a fair price for a financial instrument. 

An RFQ is an electronic message sent by one bank to another bank to start a trade.

An RFQ can be sent to a bank just to see the pricing of a financial instrument, there is no obligation to trade.

RFQ is a concept in electronic interbank trading, when the banks do not trade via an exchange but directly with each other. 

An RFQ is the opening price of a financial instrument on an exchange.

An RFQ is when broker demands a designated sponsor to give a price for Bid/Offer.

An RFQ would be connected to a pricer, so the bank can issue quotes automatically. 

An RFQ would normally be followed by an offer to buy/sell a financial instrument.

A CSD is keeping the financial funds for it*s clients, ensuring settlement, novation and netting of transactions.

A CSD is keeping the financial assets on record and ensuring the legal ownership is registered, and matained (Safekeeping, Legal Custody) 

A CSD can provide asset servicing (ie administration corporate actions)

Vertical integration is when all post-trade transaction processing is concentrated in on e single company (Central Counterparty, Central Security Depository, Issuer, Share Registrar).

Vertical integration is when all pre- and post trade transaction processing is concentrated in on e single company (Investor, Exchange, Central Counterparty, Central Security Depository, Issuer, Share Registrar).

A Clearing House is a financial institution dealing with the clearing and settlement of transactions.

A Clearing House is monitoring, controlling and enforcing the legal compliance of all trading operations at an Exchange.

A Clearing House is a financial institution organizing the pre trade process in financial exchanges.

A Clearing House is a financial institution selling services in transaction management to other financial institutions. 

A CCP is especially usefull in interbanking transactions, and Over the Counter (OTC) which are not organized on a central exchange.

A CCP is an independent handler of financial transactions ensuring that buyers and sellers meet their obligations.

A CCP is an exchange where you can sell a financial instrument without having a buyer.

A CCP is a bank for banks responsible for clearing and settlement of transactions.