General Synonyms:
* Explanation
* Analysis
* Understanding
* Construction
* Exposition
* Rendering
* Translation
* Paraphrase
* Commentary
* Reading
More specific synonyms:
* For art or literature: Reading, analysis, critique, appreciation, commentary, perspective
* For legal documents: Construction, legal opinion, judgment
* For data: Analysis, evaluation, assessment, conclusion
The best synonym for "interpretation" will depend on the specific context in which you are using the word.