As used in this chapter:

1. (a) “Board” means the State Allocation Board.
2. (b) “Director” means the Director of Education.
3. (c) “Project” means the purpose or purposes for which a school district has applied for an apportionment or apportionments.
4. (d) “Apportionment” means an apportionment made under this chapter unless the context otherwise requires.
5. (e) “Urban district” means any school district, the boundaries of which are substantially identical to or which encompass the boundaries of a city having a population in 1960 of not less than 50,000 persons.