The Collaborative International Dictionary of English v.0.48:

object file \ob"ject file\, object program \ob"ject program\, n.
   (Computers)
   A computer program which has been translated into machine
   language by a compiler and assembler, but not yet linked into
   an executable program; sometimes called an obj file,
   because its file name typically has the extension "obj" .
   [PJC]

WordNet (r) 3.0 (2006):

object program
    n 1: a fully compiled or assembled program ready to be loaded
         into the computer [syn: object program, target program]
         [ant: source program]