The science of exegesis and interpretation is a very complex one and so, there are so many definitions available for it. According to "Amin al-Islam Tabarsi" exegesis and interpretation is unveiling the obscure words. In other words it is uncovering the verses of the Holy Quran and their purposes.
On different occasions, Imam interpreted the Holy Quran verses and these interpretations have been compiled in five volumes. This exegesis of the Quranic verses by Imam contains so many niceties and nuances of interpretation. Imam's Exegesis (Tafsir) of the verses of the Holy Quran can be traced in his works like, "Adab-o-Salah", "Sahifah i-Imam", "Kashf al-Asrar", "Sharh i-Dua i-Sahar", "Sharh i-Chehel Hadith", etc.
According to Imam Khomeini, the major element in the Exegesis (Tafsir) of the Holy Quran is expressing the purposes of the verses of the Holy Quran and stating the intention of Allah the Almighty.
He believed that no thorough and exhaustive interpretation of the Holy Quran is provided yet and expresses his dismay why brutal monarchs during the early period of Islamic history did not allowed the Twelve Infallible Imams to provide a perfect interpretation of the Holy Quran.
He does not consider available interpretations as perfect interpretations and only considers them as exemplifications and definitions, because he refers to interpretation as disclosing the intention and purposes of the verses of the Holy Quran.
Imam Khomeini considers the Holy Quran as a miracle not just due to its cohesion, coherence or rhetoric, but in spite of the Holy Prophet (peace be upon him and his household) not being literate it contains elevated theosophical and spiritual notions. The interpretation that Imam Khomeini provides has theosophical dimensions; however, because of Imam's complete mastery of different Islamic sciences, signs from other fields are quite traceable.