The phrase "the primary requirement" is grammatically correct and can be used in written English.
Example: The primary requirement for this job is a college degree in a related field.
We interpret the effect of syp mutations and Syp overexpression on osk mRNA anchoring as being due to an indirect effect of reducing Osk protein levels, as Osk is known to be required for anchoring of osk mRNA, and that the primary requirement for Syp in osk mRNA function is in its translational regulation (Vanzo and Ephrussi, 2002).
Benevolence is the primary requirement.
The primary requirement for maintaining aquatic organisms is water quality.
Determination of 'fitness for purpose' is the primary requirement.
This is the primary requirement that every coach, regardless of his scheme, demands.
A level playing field is the primary requirement for social mobility and diversity to thrive.
The primary requirement was to obtain the altitude of breakup of the EPC.
E. B. White suggested that the primary requirement for success in New York is a willingness to be lucky.
The primary requirement for your computer is that it can run MATLAB (from Mathworks).
The primary requirement for the January term is that you do not feel you need an internship.
Most do not have six months or less to live, the primary requirement, and some have received hospice services for months.
