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(computer science)
A computer operation in which two numbers are compared as to identity, relative magnitude, or sign.



comparing a gauge or quantity to be measured with a quantity that is reproducible in the measuring process.

Comparisons are made by instruments such as the equal-arm balance, the electric potentiometer, the photometer bench with a photometer, and the comparator for linear standards.



an act of thought by means of which the content of being and cognition is classified, ordered, and evaluated; in comparison, the world is understood to be “coherent” diversity. The act of comparison consists of the pairing of objects for the purpose of clarifying their relationship. Essential to this are the conditions, or bases, of comparison—the attributes that determine precisely what the possible relationships are between objects.

Comparison has meaning only in an aggregate of “homogeneous” objects that form a class. The comparability of objects in a class (tertium comparationis) is realized in terms of the attributes essential for a particular examination; objects comparable in terms of one basis may be incomparable in terms of another. For example, all people are comparable in terms of age, but not all are comparable with respect to “being older.”

The simplest and most important type of relationships revealed by means of comparison are the relationships of identity (equality) and difference. Comparison of this type leads in turn to the concept of universal comparability, that is, the notion that it is always possible to answer the question of whether objects are identical or different. Objects of visual experience are always comparable, although the condition of visibility, or observability, is a significant restriction. In theory, the visual comparison of objects is often impossible, and to compare objects it is necessary to resort to inferences and, eventually, to certain abstractions from which the inferences have been deduced. The supposition of universal comparability is therefore sometimes called the abstraction of comparability. As a rule, the abstraction of comparability is a nontrivial hypothesis and is valid within the framework and on the basis of the main principles of theory.

M. M. NOVOSELOV [24–1047–1; updated]

References in periodicals archive ?
Hypothesis 2: Academic comparisons, including comparison motivation, comparison inclination, and comparison style, will have an impact on secondary school students' subjective well-being.
Statistically significant differences were evident indicating that students in the treatment schools had outperformed their peers in the comparison schools in all three areas of achievement.
SQL Effects Clarity is an advanced database comparison tool focusing on providing software developers, DBAs, quality engineers and other IT professionals the ability to determine in detail the differences between two databases.
Also, the sales comparison approach is most applicable in understanding the fee simple interest of owner-occupied properties whereas, for leased buildings, it tends to be considered a secondary methodology for estimating market value.
One reason perceived QOL may have changed is because a disease-specific camp allows for more realistic comparisons with other children.
By 1997, resolution strength and computing power made it possible to go beyond the traditional 30x comparisons, and look at smaller agglomerates through the higher magnification of 100x.
SQL Server Comparison Tool can analyze and compare databases, even if they reside on different servers, making it ideal as a tool to verify the integrity of backup and disaster recovery databases.
Many CIPM key comparisons are not simple because it is often impractical or impossible to realize exactly the same measurand for or by all participants.
Again using the more reliable within-cohort comparisons, Jacobsen and his colleagues found that in both math and reading a black-white gap was virtually always present, even for students whose scores were similar just one or two years earlier.
However, in the past decade, technology developers have created automated bullet-matching workstations that meld traditional comparison microscopes with digital cameras, lasers, computers, huge databases, and image-analysis techniques.
This then provides a comparison of working disk subsystems and tape subsystems, not just comparisons of the individual components.