Hiding complexity, showing essential features.

In computing, an abstraction layer or abstraction level is a way of hiding the working details of a subsystem.

In clinical psychology, selective abstraction is a type of cognitive bias or cognitive distortion in which a detail is taken out of context and believed whilst everything else in the context is ignored.

(computing theory) A lambda term of the form (λx.t) where x is a variable and t another lambda term. Any free instance of x within t (considered by itself) then becomes bound by the λx. prefix. It is meant to represent an anonymous function.

Hypostatic abstraction in philosophy and mathematical logic, also known as hypostasis or subjectal abstraction, is a formal operation that transforms a predicate into a relation; for example "Honey is sweet" is transformed into "Honey has sweetness".