• quality
• container quantity
• Indefinite Modality
• Definite Modality
• analogy
• name
• quality
• quantity
• accident
• property

SINGULAR AND GENERAL EXISTENCE

Singular existence is the existence of individual entities while general existence refers to the existence of concepts or universals.

PHYSICAL AND MENTAL EXISTENCE

In contemporary philosophy, there are at least three prevailing ways to understand what a concept is:

ABSTRACT AND CONCRETE

Entities present in space and time have concrete existence in contrast to abstract entities, like numbers and sets. The type–token distinction identifies physical objects that are tokens of a particular type of thing. The type of which it is a part is in itself an abstract object. The abstract–concrete distinction is often introduced and initially understood in terms of paradigmatic examples of objects of each kind:

• relative action and motion
• relative velocity
• social relations

• Variables
  • unknown variable
  • known variable
• parameter
  • known
  • unknown
• known
  • indefinite
  • definite
• unknown
  • indefinite , doubtful , suspicion
  • definite parameter