The phrase "a most decisive" is correct and usable in written English.
It can be used to emphasize the importance or impact of a decision or action in a formal context.
Example: "The committee reached a most decisive conclusion that would shape the future of the organization."
Alternatives: "a highly significant" or "an extremely critical".
"She's incomparable, irreplaceable, and indispensable," says Miller, who was a key figure in one of the center's most decisive victories, a 2005 court case that blunted an attack on evolution by the Dover, Pennsylvania, school district.
Paternal backcrosses i.e., crosses between a hybrid female and a parental male, are the most decisive, as under sex-linkage the offspring of each cross is expected to have a uniform genotype with respect to that factor.
On an equally sunny day a week earlier, at Monmouth Battlefield in Manalapan, site of the Revolutionary War's most artillery-laden battle and one of Washington's most decisive victories, a man walks his beagle through a vast, grassy field.
Yet, detailed experimental data to confirm this assumption is missing, as well as an identification of the most decisive factors for bund infiltration.
Livingston also had a hand in Jackson's most decisive step: on December 16, 1814, Jackson declared martial law.
Perhaps most decisive was a line of reasoning that became known as "the ultimate argument for realism," which appeared in two major versions.
Scrapping the King James version, in the well-meaning way of the well-educated classes, had a number of effects, the most decisive and the most disastrous of which was to destroy for ever an ordinary, everyday connection with 400 years of the English language.
The model area exposed to cold high-latitude atmospheric conditions thus being most decisive for a realistic representation of the long-term deep-ocean properties, suggests that high-latitude coastlines are definitely in need of being represented at high resolution, including ice sheets and their effects on the heat and freshwater flux for the ocean.
"When combined with their proposals to devolve all income tax to the Scottish Parliament, Scottish MPs would be removed not just from ordinary lawmaking on English matters but from the most decisive votes a parliament can make - votes on income tax rates and thus on passing the budget".
This is the latest and most decisive in a progressive series of steps to loosen the policy -- most notably, a change in 2013 allowed couples to have an extra child if either parent was an only child. .
