"prevalent at that time" is correct and usable in written English.
It is a phrase used to describe something that was widespread in a certain period of time. For example, "The Victorian era was marked by a prevalence of traditional gender roles that were prevalent at that time."
And perhaps this desire to deify the singer, to stress her purity and goodness, reflected something prevalent at that time, namely an anxiety about the moral status of singing, the probity of performance, of The Stage.
Ward was opposed to associationism, a theory prevalent at that time, and together with G.F. Stout introduced a functionalistic approach that was later developed in the United States by William James.
The conversations seemed coded in a language I didn't know, and certainly not in the teen-age slang prevalent at that time, of which I now remember barely a couple of expressions, but in a much more ominous slang where each verb and each sentence had a touch of funeral and of holes.
The formal rule of the proportionally more numerous than in other European countries nobility constituted a sophisticated early democratic system, in contrast to the absolute monarchies prevalent at that time in the rest of Europe.
There are varying interpretations of the original intent of Congress and of the ratifying states, based on statements made during the congressional debate over the amendment, as well as the customs and understandings prevalent at that time.
Differential diagnoses included cholera, meningitis, and cerebral malaria, as these conditions are prevalent at that time of the year; however, investigations disproved these diagnoses.
However, an examination of Brues' descriptions of other species assigned by him to Rhogas revealed that his concept of the genus was an idea (prevalent at the time) that encompassed Aleiodes sensu van Achterberg [ 13].
In a classic 1982 Esquire piece, Ron Rosenbaum went to Las Vegas to examine the notion, prevalent at the time, that Wayne Newton was a great entertainer — and one whose greatness could only be appreciated if you saw his live show.
It is derived from the Latin gutta, meaning "drop" and was hit upon because of a belief, prevalent at the time, that the pain was caused by a poison tha tered the afflicted joint drop by drop.
"In each instance there was a certain social comment about conditions that were prevalent at the time," he said.
The blaze in the Greenwich Village factory, at Washington Place and Greene Street, brought to light the sweatshop conditions that were prevalent at the time; many of the garment workers who died were immigrants, and most were women.
