The word "law" in legal texts reminds us several concepts. This word is used five times in the principle 138 of the Constitution without having the same meaning. Determining the meanings of this word in the principle 138 can contribute to formulate an appropriate strategy for providing the rule of law in the field of government regulations and review them. This article argues that the word "law" in terms such as "the executive regulations of principle laws" and "providing of execution of laws" and the last sentence of the principle 138 of Constitution means ordinary laws, but this word in terms "spirit of law" and "within the laws" means both the constitutional and ordinary laws.
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