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. Usage notes . Many nouns formed with -ity are uncountable; those that are countable form their plurals in -ities.
Duncan Hazlett McGuire was an Australian musician, songwriter, recording engineer and producer. He was associated with vocalist, Doug Parkinson, in various groups during the 1960s and 1970s; McGuire was also a founding member of the jazz fusion band, Ayers Rock from 1973 until he left in 1976.
Duncan is Macbeth's murder victim in the Shakespeare play Macbeth. Duncan is the incumbent Thane of Cawdor. Lady Macbeth and Macbeth plot to kill Duncan and take over his reign, and Macbeth stabs Duncan.