Definition: lit, separation of the two parts of a thing; the term is generally applied to the separation of the constituent words of a compound word: it is described to be of two kinds : (a) शास्त्रीयविग्रहृ or technical separation; e. g. राजपुरुष्: into राजन् ङस् पुरुष सु and (2) लौकिकविग्रहं or common or popular separation; e. g. राजपुरूष: into राज्ञ: पुरुष:. It is also divided into two kinds according to the nature of the constituent words (a) स्वपदाविग्रह separation by means of the constituent words, e.g. राजहितम् into राज्ञे हृितम्;(b) अस्वपदविग्रह, e. g. राजार्थम् into राज्ञे इदम्;or e.g. सुमुखीं into शोभनं मुखं अस्याः cf. M.Bh. on P.V.4.7. The compounds whose separation into constituent words cannot be shown by those words (viz. the constituent words) are popularly termed nityasamsa. The term नित्यसमास is explained as नित्यः समासो नित्यसमासः | यस्य विग्रहो नास्ति । M.Bh. on P.II.2.19 Vart. 4. The upapadasamsa is described as नित्यसमास. Sometimes especially in some Dvandva compounds each of the two separated words is capable of giving individually the senses of both the words e.g. the words द्यावा and क्षामा of the compound द्यावाक्षामा. The word विग्रह is found used in the Pratisakhya works in the sense of the separate use of a word as contrasted with the use in a compound; cf अच्छेति विग्रहे प्लुतं भवति R.Pr.VII.1. विग्रहृ is defined as वृत्यर्थावबोधकं वाक्यं विग्रहः in the Siddhantakaumudi.