Meaning : Existing as an essential constituent or characteristic.
Example :
The Ptolemaic system with its built-in concept of periodicity.
A constitutional inability to tell the truth.
Synonyms : built-in, constitutional, inbuilt, integral
Meaning : In the nature of something though not readily apparent.
Example :
Shortcomings inherent in our approach.
An underlying meaning.
Synonyms : implicit in, underlying