Wiktionary
n. A paper, issued by a government, that a parent can use as payment for his child's tuition at any school.
Wikipedia
A school voucher, also called an education voucher, in a voucher system, is a certificate of government funding for a student at a school chosen by the student or the student's parents. The funding is usually for a particular year, term or semester. In some countries, states or local jurisdictions, the voucher can be used to cover or reimburse home schooling expenses. In some countries, vouchers only exist for tuition at private schools. Under many non-voucher education systems, people who pay for private schooling are still taxed for public schools, these parents fund both public schools (through taxes) and private schools (through tuition) simultaneously; although, in some countries, states or local jurisdictions (e.g. in Australia) private schools may still receive substantial government funding.
Usage examples of "school voucher".
Arizona's first Libertarian governor, Durwood Thornley, is proposing to extend the school voucher system to a whole variety of taxpayer opt-outs, and his critics are not very happy about it.