Income derived from sources related to a company's everyday business operations. For example, in the case of a retail business, inventory sales generate operating revenue, whereas the sale of a warehouse does not. Instead, the latter sale is considered to be an unexpected, or "one-time", event.
Also referred to as "regular revenue".
Taobiz explains Operating Revenue
By examining a company’s operating, or "regular," revenue an investor can often gain meaningful insights into the health of a business, especially since fading companies often sell underperforming stores and/or assets, making the income statement look more attractive than it might otherwise be. Operating revenue is not the same as operating profit, which is the more commonly used metric in financial statement analysis.