Wordnet 3.0
ADJECTIVE (1)
1. 
 existing as an essential constituent or characteristic; 
- Example: "the Ptolemaic system with its built-in concept of periodicity"- Example: "a constitutional inability to tell the truth"[syn: built-in, constitutional, inbuilt, inherent, integral]
WordNet (r) 3.0 (2006):
inbuilt
    adj 1: existing as an essential constituent or characteristic;
           "the Ptolemaic system with its built-in concept of
           periodicity"; "a constitutional inability to tell the
           truth" [syn: built-in, constitutional, inbuilt,
           inherent, integral]