(originally nautical, informal) To learn the basics or master introductory knowledge. / (informal) To learn some skill requiring specialist knowledge.

(law) A text that is sufficiently well received in its field that it may overcome a hearsay objection and be admitted into evidence in a court of law.

plural of learned treatise

An organization that exists to promote an academic discipline or group of disciplines.

(often disparagingly) Versed in books; having knowledge derived from books.

plural of learned society

An exhortation to gain knowledge from lived experiences. Commonly used after a misfortune to indicate a moral lesson.

(linguistics) A word or other linguistic form borrowed from one language into another on purpose instead of through normal language contact, especially one from a classical language.

plural of must-learn

Something that one is strongly recommended to learn.