Noun

(en noun)

A student; one who studies at school or college.

A specialist in a particular branch of knowledge.

A learned person; a bookman.

*{{quote-magazine, year=2013, month=September-October, author=(Henry Petroski)

, magazine=(American Scientist), title= The Evolution of Eyeglasses , passage=The ability of a segment of a glass sphere to magnify whatever is placed before it was known around the year 1000, when the spherical segment was called a reading stone,

Noun

(en noun)

A person who practices a profession or art, especially law or medicine.

*{{quote-magazine, date=2014-06-21, volume=411, issue=8892, magazine=(The Economist)

, title= Magician’s brain , passage=The [Isaac] Newton that emerges from the [unpublished] manuscripts is far from the popular image of a rational practitioner of cold and pure reason. The architect of modern science was himself not very modern. He was obsessed with alchemy.}}

One who does anything customarily or habitually.

(label) A sly or artful person.

* John Whitgift

the men of St. John's were cunning practitioners , in shaking off their Masters and Heads.