Usage Note: An absolute term denotes a property that a thing either can or cannot have. Such terms include absolute itself, chief, complete, perfect, prime, unique, and mathematical terms such as equal and parallel. By strict logic, absolute terms cannot be compared, as by more and most, or used with an intensive modifier, such as very or so. Something either is complete or it isn't—it cannot be more complete than something else. Consequently, sentences such as He wanted to make his record collection more complete, and You can improve the sketch by making the lines more perpendicular, are often criticized as illogical. Such criticism confuses pure logic or a mathematical ideal with the rough approximations that are frequently needed in ordinary language. Certainly in some contexts we should use words strictly logically; otherwise teaching mathematics would be impossible. But we often think in terms of a scale or continuum rather than in clearly marked either/or categories. Thus, we may think of a statement as either logically true or false, but we also know that there are degrees of truthfulness and falsehood. Similarly, there may be degrees of completeness to a record collection, and some lines may be more perpendicular—that is, they may more nearly approximate mathematical perpendicularity—than other lines. See Usage Notes at equal, unique.