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The phrase "a definition is lacking" is correct and usable in written English.
It can be used when indicating that a specific term or concept does not have a clear or provided definition.
Example: "In this discussion, a definition is lacking for the term 'sustainability,' which leads to confusion among participants."
Alternatives: "a definition is missing" or "a definition is absent".
Similar(60)
Although a consensus definition is lacking, DGE with persistent need for nasogastric intubation occurs in 20-50% of patients, most often in the elderly, and may worsen the nutritional state and prolong hospitalisation.
Two-thirds (67%) were concerned that a common definition is lacking and 83% said it is likely that sepsis is frequently missed.
(Male patient, 46 years old, ankle strain, physiotherapy at an outpatient clinic) Care providers agreed that PIEM is generally not a part of their management strategies and that a generally accepted definition is lacking.
Concerted actions of producers, users, and especially regulators are necessary to overcome these barriers, but the prerequisite of a shared problem definition is lacking.
Diminished diuretic response is common in patients with acute heart failure, although a clinically useful definition is lacking.
Health policy recommends a patient-centred approach [ 19– 21], but an agreed global definition is lacking [ 22, 23].
6 11 Again, and somewhat surprisingly, a precise widely agreed definition is lacking.
For older individuals, in whom a satisfactory clinical case definition is lacking, the surveillance case definition was based on that described by the British Thoracic Society [ 17]. * Measured over one minute: > 60 if < 2 months of age; > 50 if 2-11 mofths of age; > 40 if 11-59 mofths of age.
Because this definition is lacking, perfusion heterogeneity was simulated with a Gaussian noise of zero mean distributed on the gray matter.
Based upon the interviews, however, it became clear that a consistent definition was lacking as to what constitutes a visual-tactile examination, and only two KIs (OS, ENT) described a VTE as including visualization and palpation of the oral cavity, head, and neck.
JD: Powerhouse fruits and vegetables (PFV) are described in the literature as green leafy, yellow/orange, citrus and cruciferous items -- but a clear definition was lacking.
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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