#essential__necessity__requirement__requisite__necessary  anything indispensable; "food and shelter are necessities of life"; "the essentials of the good life"; "allow farmers to buy their requirements under favorable conditions"; "a place where the requisites of water fuel and fodder can be obtained"
  exclusion:  #inessential
  subtype:  #desideratum  #want
  supertype:  pm#entity_playing_some_role  e.g., an agent, an owner
     supertype:  pm#entity  something that can be "involved" in a situation
        supertype:  pm#thing__something___T__t___3D_or_4D_thing_or_anything_else  any category (type or individual) is instance of this type; any type is also a subtype of this type
     supertype:  pm#thing_that_can_be_seen_as_a_relation  usable as relation type
        supertype:  pm#thing_playing_some_role  category to classify things according to roles/viewpoints; classification under this category is application-dependant
           supertype:  pm#thing__something___T__t___3D_or_4D_thing_or_anything_else  any category (type or individual) is instance of this type; any type is also a subtype of this type

No statement uses or specializes #essential; click here to add one.