A period of time containing 365 (or 366) days.
Estimated period of time for the Earth's orbit around the Sun and observed at a fixed geographic point (averaging 365.24 days); base later modified to define or adjust various calendars.
A body of students who graduate together.
The time it takes the Earth to complete one revolution of the Sun (between 365.24 and 365.26 days depending on the point of reference).