Object-oriented

from 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]

from The Free On-line Dictionary of Computing (8 July 2008)

object-oriented
object-orientation
OO

   1. <programming> (OO) See {object-oriented programming}.  See
   also {object-oriented analysis}, {object-oriented database},
   {object-oriented design}.

   2. <graphics> {vector graphics}.

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