Suffix -ity Used to form a noun from an adjective; especially, to form the noun referring to the state, property, or quality of conforming to the adjective's description. Used to form other nouns, especially abstract nouns. Many nouns formed with -ity are uncountable; those that are countable form their plurals in -ities.
King Duncan is a fictional character in Shakespeare's Macbeth. He is the father of two youthful sons (Malcolm and Donalbain), and the victim of a well-plotted regicide in a power grab by his trusted captain Macbeth.
Dr. Ian Duncan (portrayed by actor/comedian John Oliver) is a psychology professor at Greendale Community College. Ian was born in Birmingham, England and grew up on 52nd street in the Islington district of London (although this is actually a writing error as confirmed by Dan Harmon, as British streets are not numbered).