The phrase "although it is defined" is correct and usable in written English.
You can use it to introduce a contrast or exception regarding the definition of a term or concept.
Example: "The term 'freedom' is often celebrated, although it is defined differently across cultures."
Alternatives: "even though it is defined" or "despite being defined".
Although it is defined as an internal angular momentum much of our understanding of it is bound up with the mathematics of group theory.
Although it is defined in general frame theory, there is a natural connection with Gabor frame theory.
Although it is defined as a combination of amino and nucleic acids identifiable by receptors on the tongue, the other important role that umami plays is the way it rounds out other flavour components.
It should be noted that stacking is a quite controversial type of interactions and although it is defined as aromatic (or π- π) noncovalent interaction between organic compounds, containing aromatic components, its exact nature is a subject of discussions [ 54].
Although it is defined in strict terms in this paper, the model is not a general theory because it does not promise a set of universal laws about the routine embedding of practices in everyday life, but rather it works as an applied theoretical model that seeks to explain the embedding of complex interventions in healthcare settings.
Due to insufficient information for much of the geographic range, P. halleri is not formally listed as vulnerable or threatened in the IUCN Red List (Walter and Gillett, 1998), although it is defined as vulnerable or regionally extinct in Switzerland (Moser et al., 2002).
Although it's defined by its honey-stone architecture and gentle landscapes, behind the sleepy exterior, you'll find exciting new hotels, restaurants and museums.
IUGR may be defined as a rupture in the normal growth curve of the foetus, although it is generally defined as a birth weight inferior to the 10th or to the 3rd percentile (according to a chosen arbitrary limit) of the smallest babies.
Although it is not defined by a single institution or set of institutions, paternalism was prevalent among the early industrial companies.
Although it is well defined in Merriam-Webster's Dictionary of Law as "capable of being expressed, explained or justified," in some usages above it is treated as a synonym for "specific"; in others, it is a softer substitute for that hard-edged word that better protects civil liberty.
Although it is not defined whether TGF- β is the universal determinants of exhaustion during persistent HBV infections, immunotherapeutic targeting IL-10 and TGF- β in CHB may provide an additional therapeutic intervention, which needs further exploration.
