year

(noun) a period of time containing 365 (or 366) days. Synonyms: twelvemonth, yr. 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. Synonyms: class. Examples: "The class of '97." "She was in my year at hoehandle high."