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I don't have sufficient context to write an accurate overview of "240" based only on the word "year." The number 240 could refer to many different things depending on the context (a year in a calendar system, a historical event from 240 AD, a distance, a quantity, etc.), and I cannot provide a reliable explanation without more information.
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The ruins of Hatra (1988)
Year 240 (CCXL) was a leap year starting on Wednesday of the Julian calendar. At the time, it was known as the Year of the Consulship of Sabinus and Venustus (or, less frequently, year 993 Ab urbe condita). The denomination 240 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.