Quenya 

nassë

person, an individual

nassë (1) "a person, an individual" (VT49:30). Also translated "true-being" (pl. nasser is attested), the inner "true" being of a person. With a pronominal suffix in the form nassentar "their true-being" (PE17:175, cf. -nta #2), in the source referring to the "true" spiritual nature of the Valar, as hidden within their visible shapes. The word nassentar would seem to be plural, *"their true-beings". Not to be confused with the verb nassë/násë "he/she is"; see #1.