Superlative: Of, relating to, or constituting the degree of grammatical comparison that denotes an extreme or unsurpassed level or extent; surpassing all others, supreme; of very high quality, excellent; excessive, exaggerated. The superlative form of nice is nicest, bad is worst, of interesting is most interesting.
The American academic system – high school, university respectively – uses the following scoring: A excellent (high school), 4.0 (university); B good, 3.0; C satisfactory, 2.0; D pass, 1.0; F fail, no credit.
Grade inflation occurs when higher grades are assigned for work that would have received lower grades in the past. The American academic community has attempted time and again to address the problem of grade inflation, but have yet to establish workable standards.