noun
- a book published annually, containing information, statistics, etc., about the past year: an encyclopedia yearbook.
- a book published by the graduating class of a high school or college, containing photographs of class members and commemorating school activities.
noun
- an almanac or reference book published annually and containing details of events of the previous year
n.1580s, “book of reports of cases in law-courts for that year,” from year + book (n.). Meaning “book of events and statistics of the previous year” is recorded from 1710. Sense of “graduating class album” is attested from 1926, American English.