The term 'A Large Indefinite Number' can be described by three words: MYRIAD (6 letters), SLEW (4 letters), and Regiments (7 letters). MYRIAD is a noun that means an extremely large number, usually of people or things. SLEW is a noun that means a large number or amount of something. Finally, Regiments is a noun that means a large group of people or things organized into a unit. All three words describe a large, indefinite number of people or things.