Section 21A(b) in The U.P. Secondary Education Services Selection Board Act, 1982
(b)the expressions 'Inspector', 'Institution', 'Management' and 'Teacher' shall have the meaning respectively assigned to them in the Uttar Pradesh High School and Intermediate Colleges (Payment of Salaries of Teachers and Other Employees) Act, 1971, provided that 'teacher' shall not include a Principal or a Headmaster.