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1. Maths
a. having a particular property in common; equal
b. (of two equations or inequalities) having the same set of solutions
c. (of two sets) having the same cardinal number
2. Maths Logic (of two propositions) having an equivalence between them
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



The equivalent of an element is the weight, expressed in carbon mass units, that will combine with or replace one atomic weight of hydrogen or one-half atomic weight of oxygen.

The equivalent of an acid is equal to the acid’s molecular weight divided by its alkalinity (number of hydrogen ions).

The equivalent of a base is equal to the base’s molecular weight divided by its acidity (number of hydroxyl groups).

The equivalent of a salt is equal to the molecular weight of the salt divided by the sum of the charges of the cations or anions forming the salt.

In oxidation-reduction reactions, the equivalent of an oxidizing agent is equal to the quotient obtained as a result of dividing the agent’s molecular weight by the number of electrons obtained by the atom or atoms of the reduced element. The equivalent may vary, depending on the number of electrons accepted by the oxidizing agent.

The concept of equivalent is widely used in the stoichiometric calculations of chemical reactions.


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
These mechanisms could contribute to the observed decrease in sperm count in adults who were exposed to TCDD and PCDD TEQs as young children (Mocarelli et al.
Figure 3, Figure 4, and Figure 5 present the TEQ concentrations found in the blood samples from the four locations and the NHANES control group.
Nationally, TEQs are again, not perfect but are far better than the alternatives.
A fractionally-spaced TEQ is a transversal filter whose tap spacing is less than the symbol interval [T.sub.s].
Regarding the two scales' test-retest reliabilities, the "TEQ" was actually not found to be a very reliable scale (r = .09, p > .05), but the "MSC" was found to be a very highly reliable means of teacher evaluations (i.e., r = .97, p < .0001).
Company director Sean Doherty said: 'We are thrilled to be receiving another TEQ Award this year.
Equivalent doses for total PAHs and dioxins/furans calculated from RGS induction are designated as "RGS BaPEQ" and "RGS TEQ" respectively.
To account for their respective potencies, each was assigned a toxic equivalency (TEQ), which relates its potential for harm to 2,3,7,8-TCDD, the most toxic of the dioxins.
As I conclude my three years as editor of Teacher Education Quarterly (TEQ), I wish to thank the Editorial Board for their service, Reyes Quezada for his help as Associate Editor, Alan Jones at Caddo Gap, former editors Chris Faltis and Tom Nelson, our copyeditor Holly Montieth, and especially the hundreds of reviewers who gave their time to adjudicate manuscripts.
After excluding congeners detected in 0% of samples (PCB-81 and 1,2,3,4,6,7,8,9-octachlorodibenzofuran) and PCBs without AhR affinity that were detected in less than 50% of samples (PCBs 52, 66, 87, 101, 110, 128, 146, 149, 151, 172, 177, 178, 183, 195, and 206), we created three summary metrics with varying TEFs from lipid-adjusted serum measurements of the POPs: non-dioxin-like PCBs, non-ortho PCBs, and toxic equivalent (TEQ).