A grade may refer to many different concepts, including: in various contexts: Each item in a (generally ordered and finite) collection of symbols or designators used as a particular grade system to distinguish and rank corresponding groups, where distinct members or instances of each group are regarded as sufficiently similar (in attributes such as performance, quality, size, age, etc.) to be classified together. Such collections are typically 1, 2, 3, 4, 5, and A, A-, B+, ..., D-, F, or Regular, Super, Premium. Examples of grade systems occur in education, either a teacher's evaluation of a student's work: see Grade (education), or Grade level, a student's level of educational progress in school. GRADE is an acronym for the reading assessment called " Group Reading Assessment and Diagnostic Evaluation." in sports, degree of difficulty of a challenge, including: Grade (climbing) Grade (bouldering) in telecommunication: Grade of service in fueling internal combustion engines: Grade of gasoline and Fuel performance rating in collectibles, such as coins and comic books, an evaluation of the condition of the item, sometimes in words ("Fair" or "Very Fine" or "Mint"), sometimes numeric (coins are graded on a scale of 0 to 70, while comics are graded from 0.0 through 10.0) in geography, railroad engineering, and other contexts sensitive to topography, a percentage ratio of elevation differential to distance (also called gradient, and a case of mathematical slope): see grade (geography) in traffic, grade separation is the process of aligning a junction of two or more transport axes on different levels. in mathematics, a unit for the measurement of plane angles: see grad see also graded vector space, graded algebra. in moving-image ( cinema and television) post-production, to grade is to perform the process (also called " color-timing") of color-correcting images. Grade is a Hardcore punk rock band of the Emo genre. in pathology, grading (tumors) is a measure of the aggressiveness of a tumor, using either a numeric grade ("Grade 2") or a descriptive grade ("high grade"). in mining the amount of metal in ore, eg. the gold grade was high in the vein. In Phylogenetics an (evolutionary) grade is a paraphyletic group of organisms. It is used in contrast to clade. See also: Rating This is a disambiguation page: a list of articles associated with the same title. If an internal link referred you to this page, you may wish to change the link to point directly to the intended article.