An adjuction between infinity categories consists of:
- A pair of infinity categories A,B
- A pair of functors ,
- A pair of natural transformations ,
Such that,

Write to mean that is left-adjoint and is right-adjoint.
Properties
Adjunctions compose.
Equivalence of categories preserve adjunctions.
Equivalence of functors preserve adjunctions.
The left adjunction of a morphism is unique up to equivalence.
If and is an equivalence then is also an equivalence.