Definition: restriction; regulation; binding; the term is very frequently used by grammarians in connection with a restriction laid down with reference to the application of a grammatical rule generally on the strength of that rule, or a part of it, liable to become superfluous if the restriction has not been laid down; cf. M.Bh. on I. 1. 3, Kas. on I. 3.63, VI. 4.11; cf. also the frequently quoted dictum अनियमे नियमकारिणी परिभाषा; (2) limitation as contrasted with विकल्प or कामचार; cf. अनेकप्राप्तावेकस्य नियमो भवति शेषेष्वनियम; पटुमृदुशुक्लाः पटुशुक्लमृदव इति; M. Bh. on II. 2. 34 Vart. 2; (3) a regulating rule; a restrictive rule, corresponding to the Parisamkhya statement of the Mimamsakas, e. g. the rule अनुदात्तङित आत्मनेपदम् P. I.3.12; the grammarians generally take a rule as a positive injunction avoiding a restrictive sense as far as possible; cf. the dictum विधिनियमसंभवे विधिरेव ज्यायान्. Par. Sek. Pari. 100; the commentators have given various kinds of restrictions,. such as प्रयोगनियम,अभिधेयनियम,अर्थनियम, प्रत्ययनियम, प्रकृतिनियम, संज्ञानियम etc.etc.; (4) grave accent or anudatta; cf. उदात्तपूर्वं नियतम् R. Pr. III. 9; see नियत (2).