The term "second year" refers to the period of time that has elapsed since a specific event or point in time, measured from one anniversary date to another. In other words, it is the passage of 12 months starting from the first anniversary of an event until the second anniversary of that same event. The term can also be used more generally to describe the period of time between two consecutive years, such as when referring to a person's age (e.g., "He turned 30 last year and will turn 31 this coming year").