1. (

• built-in ,
• constitutional ,
• inbuilt ,
• inherent ,
• integral

) existing as an essential constituent or characteristic; "the Ptolemaic system with its built-in concept of periodicity"; "a constitutional inability to tell the truth" ;

2. (

• implicit_in ,
• inherent ,
• underlying

) in the nature of something though not readily apparent; "shortcomings inherent in our approach"; "an underlying meaning" ;