Open Rate: The number of HTML message recipients who opened your email, usually as a percentage of the total number of emails sent. The open rate is considered a key metric for judging an email campaign's success, but it has several problems. The rate indicates only the number of emails opened from the total amount sent, not just those that were actually delivered. Opens also can't be calculated on text emails. Also, some email clients also users to scan message content without actually opening the message, which is falsely calculated as an open. See preview pane.

 

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Open Rate: The number of HTML message recipients who opened your email, usually as a percentage of the total number of emails sent. The open rate is considered a key metric for judging an email campaig . . . View Full Definition

Open-Market Purchase Operation: A systematic program of repurchasing shares of stock in market transactions at current market prices, in competition with other prospective investors.

Open-Outcry: The method of trading used at futures exchanges, typically involving calling out the specific details of a buy or sell order, so that the information is available to all traders.

Open-Market Rates: Interest rates that are determined in the open market by supply and demand, as opposed to being set by the Federal Reserve Board.