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"then dominant" is correct and usable in written English.
It can be used to describe something that was dominant before something else happened. For example, "Before the appearance of the internet, print media was then dominant."
Exact(31)
Exquisitely intimate, the films offer a deeply human alternative to Hollywood's then dominant vision of the pathological (or dead) homosexual.
His father was an MP for the rightwing Herut party, in opposition to the then dominant Labour movement, and which became part of Likud.
"Zambezi" is one of the artist's later diamond-patterned black paintings, a watershed between the Abstract Expressionists who were then dominant and the emerging Minimalists.
Its success was partly caused by a reaction by composers and audiences against the artificial conventions of the then dominant Italian opera.
At the time, the inability of the then dominant international power, Britain, to integrate Germany ultimately ended in two devastating world wars.
He started out as a clinical psychologist but quickly became disenchanted with the idea, then dominant in the field, that individual problems could be analyzed and treated individually.
Similar(29)
The Bharatiya Janata Party rose to power on an aggressive Hindu nationalist platform during the 1990s, when the disarray in the until-then dominant Congress party created a political vacuum.
It was all a thinly veiled critique of the then-dominant Southern sound, which they vilified for its simple lyrics and dancefloor beats.
These meticulously planned and executed paintings possess a wit and gaiety in contrast to Abstract Expressionism, the then-dominant style of art.
You can still feel in it that the young Mr. Taylor here is addressing America's two then-dominant choreographers, Balanchine and Graham.
Her character was intended as little more than a gimmick to help the Manchester-based soap opera compete in the ratings battle with then-dominant EastEnders.
Write better and faster with AI suggestions while staying true to your unique style.
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com