The phrase "a diminishing amount" is correct and usable in written English.
It can be used to describe a quantity that is gradually decreasing over time.
Example: "As the project progressed, we noticed a diminishing amount of resources available for completion."
Alternatives: "a decreasing quantity" or "a reduced amount".
So we have a diminishing amount going into the black.
As the product matures, becoming more standardized and better known, a diminishing amount of specialized knowledge is needed to sell it.
Nursing home care will represent a diminishing amount of long-term care over all, with retirement communities, assisted living and home- and community-based options becoming more attractive alternatives.
Our future, if we continue on our current projectile, is one in which an increasing amount of time, energy and money is spent in the pursuit of moulding our physical forms into a socially accepted blu-print and a diminishing amount of time is devoted to doing anything else.
And there's limited income to deal with, so everybody's going after a diminishing amount of dollars going towards an ever-expanding amount of entertainment.
This has the effect that multiple ranging updates will not make the position error covariance collapse, which captures the fact that due to correlated errors, during standstill, multiple range measurements will contain a diminishing amount of information; and during motion, the range measurements should only 'herd' the dead reckoning.
In the aftermath of the 2008 recession, everybody was looking for ways to save and generally be smarter about using the diminishing amount of what they had.
Once synonymous with the rave scene, its popularity declined as the diminishing amount of methylenedioxymethamphetamine, or MDMA, the potent chemical once found in ecstasy tablets, saw a new generation of clubbers seek alternative substances.
The market malfunctions have been assigned part of the blame for the diminishing amount of trading happening on the nation's stock exchanges.
The popularity of meal replacement drinks has been surging in the United States over the past few years, driven by the obesity epidemic and Americans' diminishing amount of leisure time, according to market research firm CB Insights.
This drop is due to the increase in sheet resistance owing to the diminishing amount of aluminum remaining in the film.
