The phrase "are exactly defined" is correct and usable in written English.
It can be used when discussing specific terms or concepts that have precise meanings or boundaries.
Example: "In mathematics, the terms used in theorems are exactly defined to avoid ambiguity."
Alternatives: "are precisely defined" or "are clearly defined".
The results show that the influence of room acoustics is insignificant even for rooms of widely different room constants, if the measuring surfaces are exactly defined and if a good space-averaging technique is used.
The SI Brochure also catalogues certain non-SI units that are widely used with the SI in matters of everyday life or units that are exactly defined values in terms of SI units and are used in particular circumstances to satisfy the needs of commercial, legal, or specialised scientific interests.
In some cases the minimal/optimal residues of a T or B cell determinant are exactly defined, while in other cases only certain key components are mapped.
Pertinent key figures for surgeries and procedures for each intervention are exactly defined in minimum volume regulations [ 44].
In cold forging, the outcoming part is exactly defined with tolerances and mechanical properties.
Due to their genetically encoded design and recombinant synthesis, the sequence and size of ELPs can be exactly defined.
Machines can utilize well-crafted algorithms for various problems, whose solutions can be exactly defined step by step.
The level of background currents cannot be exactly defined; it strongly depends on the composition of carbon paste as well as upon the type of measurement.
The disadvantage with the method is that the AP position clearly influences the results and the AP position must be exactly defined.
In a semantic network every relationship has to be exactly defined and labeled according to a principle similar to conceptual maps.
The sensitivity of the deformation field within the microstructure is exactly defined and an averaging principle is developed to compute the sensitivity of homogenized stresses at the macro-scale due to perturbations in the process parameters.
