n. a learned person (especially in the humanities); someone who by long study has gained mastery in one or more disciplines

n. someone who pursues a study or sport as a pastime

n. any of a group of Greek philosophers and teachers in the 5th century BC who speculated on a wide range of subjects

n. a person who has been converted to another religious or political belief

n. someone who believes and helps to spread the doctrine of another

n. a stubborn person of arbitrary or arrogant opinions

n. someone who educates young people

n. someone (especially a child) who learns (as from a teacher) or takes up knowledge or beliefs

n. a person skilled at symbolic logic

n. someone who has entered a religious order but has not taken final vows

n. a learner who is enrolled in an educational institution

n. a structure or marking that serves to direct the motion or positioning of something