§ 3101. Definitions. As used in this article:

1. "Teachers" shall mean all full-time members of the teaching and supervisory staff of each school district of the state, including, if employed in such district, the superintendent of schools, associate, district or other superintendents, members of the board of examiners, directors, inspectors, supervisors, principals, administrative assistants, first assistants, teachers, school psychologists, social workers in a city having a population of over one million, lecturers and special instructors, except employees holding the positions enumerated in subdivisions one and two of section thirty-one hundred six of this article.

2. "Year of service" shall mean the number of years which a teacher has served in the school district in which he is employed including the year for which a determination for salary purposes is made.

3. Except in a city having a population of one million or more, "salary" shall mean the amount of compensation that is to be paid to a teacher for services rendered during the full ten months period that the public schools of the district are required by law to be in session during any school year. For purposes of prorating the salary of a teacher not rendering all the service required of teachers during such period, the monthly rate for the services rendered shall be at least one tenth of the salary and the daily rate at least one two-hundredth of the salary. If any teacher is required to render services beyond the ten months period in any school year, the compensation for such additional services shall be at least the monthly or daily rate used in prorating the salary.

4. "Transfer credit" shall mean the credit given by the school authorities to a teacher for years of service outside the school district.