The phrase "authoritative instruction" is correct and usable in written English.
It can be used when referring to guidance or directives that are considered to be reliable and commanding in nature.
Example: "The teacher provided authoritative instruction on the subject, ensuring that all students understood the material thoroughly."
Alternatives: "definitive guidance" or "official directive".
If the personal representative wishes to obtain authoritative instructions on a problem occurring in the course of the administration, he can turn to the Chancery Division of the High Court.
The entire room was meditating and following Will's gentle but authoritative instructions, a sight rare to behold in a nightclub.
But authoritative instructions; mandates issued, which the member is bound blindly and implicitly to obey, to vote, and to argue for, though contrary to the clearest conviction of his judgment and conscience,--these are things utterly unknown to the laws of this land, and which arise from a fundamental mistake of the whole order and tenor of our constitution.
The clean linework, on the other hand, is a result of his inclination towards minimalism, where there is an impulse to "display ideas in a very functional, authoritative manner similar to instruction manuals".
Gillard had not received a readout of the Leslie-Rood meeting but confirmed that her instructions would be authoritative.
The intervals between instructions became longer; the voice, as authoritative as ever, kept taking us the wrong way down one-way streets.
Conscience, usually informed by acculturation and instruction, is thus generally understood to give intuitively authoritative judgments regarding the moral quality of single actions.
The Handbook of Research on E-Learning Applications for Career and Technical Education: Technologies for Vocational Training provides an authoritative reference collection on leading international insights into the integration of technology tools and applications with adult and vocational instruction.
Students grasped the dual point of the exercise: while even the most authoritative critics' arguments from evidence should be scrutinized, no evidence carries instructions about its most effective use.
In the feeding domain, authoritarian practices include parental control and indisputable instructions on what to eat [ 46, 47], while authoritative practices include using discussion, negotiations, and reasoning for desirable eating behavior [ 48].
