Account value: is the total dollar value of all holdings in the trading account, including total cash, settled and unsettled.

Acquisition: is a transaction between two companies in which one of them buys part or all of the shares of the other company in order to exercise control over it.

APR (Annual Percentage Rate): refers to the annual interest earned on an amount charged to borrowers or paid to investors. The APR is expressed as a percentage that represents the actual annual cost of funds over the term of a loan or income earned on an investment.

Automated Clearing House (ACH): is an electronic funds-transfer system that facilitates payments in the U.S. and internationally.

Automated Customer Account Transfer Service (ACATS): is a system that facilitates the transfer of securities from one trading account to another at a different brokerage firm or bank. This has to be requested by the user.

Available for withdrawal: the balance available for withdrawal is the result of the total balance minus the value of pending orders, pending withdrawals and pending deposits.

Average cost: is the weighted average amount paid for the shares. It is the average amount paid for each share of that company or ETF.

Average volume: the average volume traded in that asset over the last month. The daily average of how many shares of a company or ETF have been bought and sold in the last month.