The term 'NOT ONE' can be expressed in four different ways using crossword solutions. The first is 'NONE', which is a pronoun meaning not one, not any, or no person. The second is 'NARY', which is an adjective meaning not one, not any, or no single one. The third is 'NIL', which is a noun meaning nothing or not one. The fourth is 'IOTA', which is a noun meaning a very small amount or not one. Finally, the fifth is 'NOPERSON', which is an adjective meaning not one or no person.