Which of the following is not defined in the Land Revenue Act of 1967?

The correct answer is Kanungo. The Land Revenue Act of 1967 typically defines fundamental terms related to land, revenue, and administration. While 'Assessment', 'Boundary mark', and 'Land' are core concepts explicitly defined within the Act's definitions section, the term 'Kanungo' (a specific revenue official) is generally not defined within the main body of the Land Revenue Act itself. Their roles and duties are often prescribed by rules made under the Act or other related statutes, rather than being a primary defined term in the Act's initial sections.