But to qualify for mailing at the First-Class Mail postcard price, it must be: 1  Rectangular. 2  At least 3-1/2 inches high x 5 inches long x 0.007 inch thick. 3  No more than 4-1/4 inches high x 6 inches long x 0.016 inches thick.
eligible - qualified for or allowed or worthy of being chosen; eligible to run for office; eligible for retirement benefits; an eligible bachelor. qualified - meeting the proper standards and requirements and training for an office or position or task; many qualified applicants for the job.
Learn about the eligibility criteria for the federal student aid programs. Different types of aid (private scholarships, state grants, etc.) have different rules, called eligibility criteria, to determine who gets the aid. Here are the eligibility criteria for the federal student aid programs.