Examlex
In the relational model,many-to-many relationships cannot be directly represented by relations the way 1:1 and 1:N relationships can.
Reification
The cognitive process of treating an abstract concept as if it were a real, tangible object.
Abstract Concept
A concept that is not tangible or concrete, often involving complex ideas or qualities such as freedom, love, or justice.
Hypothetical
Pertaining to situations, conditions, or concepts that are possible or imagined rather than real or actual.
Concrete Object
An object that exists in physical form and can be perceived by the senses.
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