PERIOD OF TIME › a period of 12 months, or 365 or 366 days, especially from 1 January to 31 December: last year/next year He joined the company a year ago.
the academic/financial, etc year › the period of a year that is used by universities/businesses, etc to organize their activities
be two/twelve/37, etc years old › to be a particular age: Her son is six years old.
a two-/twelve-/37-, etc year-old › someone who is a particular age
STUDENTS UK › a group of students who start college or a course together: He wasin my year at school.