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A substance added in small amounts to something else to improve, strengthen, or otherwise alter it.
1. Marked by, produced by, or involving addition.
2. Of or being any of certain primary colors of wavelengths that may be mixed with one another to produce other colors. See Table at color.

ad′di·tive·ly adv.
ad′di·tiv′i·ty n.


the state of being additive
References in periodicals archive ?
LeBlanc and Wang point out that we did not demonstrate synergy; they stated that "to invoke synergy, one must--at a minimum--exclude the possibility of concentration or response additivity.
MFI and densities of PETG/POM blends changed as a function of composition according to the additivity rule [22].
The amorphous nature of PET was confirmed by density measurements of pure PET, LLDPE, and the blends because the density of the blends was close but below additivity.
Key words: additivity assumption, combined risk, cumulative risk, mixtures, multiple stressors, risk assessment guidelines.
5] reported that the complex viscosity also followed the log additivity rule at any frequency for LLDPE/LDPE, LLDPE/HDPE, and HDPE/LDPE blends.
Concentration additivity may appear as synergy when individual constituents, sharing the same mechanism of toxicity, in a mixture are all present below the threshold concentrations required for toxicity.
Additivity of the volume measures for industry output makes the problem of deriving an additive decomposition formula for labour productivity straightforward.
aureus, the data obtained from the checkerboard assay were analysed by nonparametric models based on the Loewe additivity model (LA) and the Bliss independence (BI) theory (Greco et al.
The corresponding drying temperature and time applied for a mixed diet which was prepared for the additivity test of LOD and consisted of corn 20%, SBM 10%, DDGS 30%, whey permeate 20%, whey powder 10%, SDPP 5%, and FM 5%.
The authors also speculated about the possible additivity of the various brominated flame retardants and their metabolites and suggested that low-dose exposure to multiple low-affinity binding compounds may result in endocrine disruption.
Predictive model assumptions are usually linearity, additivity, and distribution.