securities trading after regular trading hours on organized exchanges. Bloomberg Financial Dictionary
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On the London Stock Exchange, dealings done after the MQP. Such dealings are treated as dealings done on the following business day. In general, trading after the hours a stock market has closed. (For all major US stock markets, after-hours trading is 16:00-18:30 Eastern Standard Time). After-hours trading often takes place after the release of news that could make the price of a stock rise or fall sharply after the close of trading. Participation in the after-hours market is strictly voluntary and may offer less liquidity and inferior prices. Exchange Handbook Glossary
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Dealing taking place after the official close of business on the trading floor of an investment exchange.
Financial and business terms. 2012.