"expeditious in" is a correct and usable phrase in written English.
You can use it to describe someone or something that tends to do something quickly and efficiently. For example: "The new CEO was known to be expeditious in making important decisions."
I have been told by members of all three organisations that he was commendably expeditious in carrying out the duties of a chairman.
The retraction system is expeditious in uncovering knowledge that is ever determined to be false (the mean time to retraction is less than two years) and democratic (retraction is not systematically affected by author prominence).
We must be expeditious in drug development, which will ultimately lead to more robust preclinical testing of compounds and better concordance between laboratory groups.
The combination showed itself to be extremely expeditious in terms of parasite clearance: by Day 1, 45.6% (50 of 109) were parasitemic, by Day 2, 0.8% was parasitemic (1 of 109), and by Day 3 the result was negative.
I think people are going to go toward a more expeditious check-in, but it's a long way out".
It would also mean that the state would be deprived of perhaps its most flexible tool, i.e. the ability to say what it wants, how it wants and, in an expeditious manner in response to a crisis.
Our goal is to get all countries to respect the Washington Principles, standards agreed on by more than 40 nations in 1998 to provide for just and expeditious outcomes in matters of Holocaust-art recovery.
At 60 percent capacity, they can't make expeditious rulings in significant cases about regulation of the environment, financial markets and other social and economic matters.
But then it adds, "This should not prove to be an obstacle, because federal and state constitutional restraints permit expeditious actions in emergency situations".
Now it is time for all parties to make plain that they desire an expeditious decision in this matter, and that legal challenges to the election will end with the final judgments of the Florida Supreme Court.
The 1982 treaty established a new right of transit passage for the purpose of continuous and expeditious transit in straits used for international navigation between one part of the high seas or exclusive economic zone and another.
