In a general sense, a series is a related set of things that occur one after the other or are otherwise connected one after the other. The specific meaning depends on the context:

• Series (mathematics)
• Series (botany) - Named selections of plants and flowers
• Series connection – a topic in electronics and electrical engineering
• An entire television program or, outside of the United States, a single year (season ) of episodes
• Animated series
• Video game series (Such as The Elder Scrolls or Metal Gear)
• Series (U.S. currency)
• Book series
• Seriation is a method of dating objects in the field of archaeology.
• Serialism is a rigorous system of writing music in which various elements of the piece are ordered according to a pre-determined ordered set or sets, and variations on them,