verb

• (rare) To study or examine carefully, especially in order to gain knowledge of; to learn, or learn by heart.
  "For Caſſius is a-weary of the World: / Hated by one he loues, brau'd by his Brother, / Check'd like a bondman, all his faults obſeru'd, / Set in a Note-booke, learn'd, and con'd by roate / To caſt into my Teeth."
• (rare, obsolete) To know; understand; acknowledge.
  "Of Muses Hobbinol, I conne no skill"

noun

• (slang) A convicted criminal, a convict.

noun

• (informal) A fraud; something carried out with the intention of deceiving, usually for personal, often illegal, gain.
  "My heart is breaking for my sister And the con that she called "love""

verb

• (transitive, informal) To trick, lie or defraud, usually for personal gain.
  "Neoliberalism has conned us into fighting climate change as individuals [title]"