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