Sell also: class
• Noun: a period of time containing 365 (or 366) days; examples: "she is 4 years old", "in the year 1920"
• Noun: a period of time occupying a regular part of a calendar year that is used for some particular activity; example: "a school year"
• Noun: the period of time that it takes for a planet (as, e.g., Earth or Mars) to make a complete revolution around the sun; example: "a Martian year takes 687 of our days"
• Noun: a body of students who graduate together; examples: "the class of '97", "she was in my year at Hoehandle High"