The phrase "a primacy" is correct and usable in written English.
It can be used when discussing the state of being primary or of first importance in a particular context.
Example: "In this debate, the primacy of individual rights must be acknowledged."
Alternatives: "a priority" or "a precedence".
An adulthood in which there is a primacy of friendship.
The Ashes have a primacy that overshadows this series, but it is not without merit.
Obesity is frowned upon since it places a primacy on food over worship.
Groups of tuatha tended to combine, but the king who claimed overlordship in each group had a primacy of honour rather than of jurisdiction.
As trade declined and industry languished, Dutch agriculture began to resume a primacy in the economy; it had always employed the majority of the workforce.
And for one brief shining moment, New York could claim a primacy in early music that it has not remotely held since.
Much of Selena's music forms similar tensions, [such as "Amor Prohibido"], in which the dominant precepts are fashioned as a murmuring, a catty whispering that achieves a certain primacy as a hegemonic disclosure.
This paradigm promotes accelerated growth and opening to global markets as essential pillars of development and poverty alleviation, and justifies the large scale extraction of natural resources as an economic primacy and an inescapable necessity.
A hypothesized, primacy recency effect of the diary procedure on symptom recall was supported.
Rawls says that "justice as fairness assigns a certain primacy to the social" (CP 339).
This association has been given the name 'ocularcentrism': the idea that among all the human senses, vision has enjoyed a particular primacy in modernity.
