The Collaborative International Dictionary of English v.0.48:

object-oriented \ob"ject-or"i*ent*ed\, a. (Computers)
   Using data structures called objects, which encapsulate data
   and typically are accessed by passing messages, which in turn
   may trigger internal procedures within the object which are
   invisible outside the object.
   [PJC]

The Free On-line Dictionary of Computing (30 December 2018):

object-oriented
object-orientation
OO

   1.  (OO) Based on objects, classes and methods,
   as in object-oriented programming or object-oriented design.
   An object-oriented database applies the same concepts to the
   storage of objects.

   2.  vector graphics.

   (2014-01-06)