A layman or dilettante was a person who possessed no accreditations in or advanced knowledge about a given field.
Later that year, he likewise cautioned Tuvok when the Vulcan asked for a copy of his neurological analysis of Tom Paris calling the report "virtually indecipherable" to the layman. (VOY: "Ex Post Facto")
In 2372, based on his home, Garak characterized Julian Bashir's character from the holoprogram Julian Bashir, Secret Agent as "some kind of rich dilettante with a fascination for women and weapons". Bashir denied it, saying his character was really a spy. (DS9: "Our Man Bashir")