(chiefly music, language learning) To play (an instrument) or sing or to learn music without reading or memorizing sheet music; to learn a language without instruction. / To do by guessing, to impr...

(education) An approach to learning that focuses on the individual learner interacting with other people.

(law) The giving of a formal opinion regarding the substance or procedure of the law, usually received from a solicitor, barrister or lawyer, ordinarily for a fee.

An inverted U shape. / An arch-shaped arrangement of trapezoidal stones, designed to redistribute downward force outward. / (architecture) An architectural element having the shape of an arch