Cervical lordosis is a curve in the cervical spine, the area of the spine which contains the neck vertebrae. This curve is entirely normal and in fact desirable because it helps to stabilize the head and spine, but when the curve straightens out, becomes too deep, or faces in the wrong direction, it can become a problem.
If something's canonical, it follows a principle or rule, usually in a religious or church-related situation. It is also used in mathematics, music and can refer to something reduced to its most basic form.
Let us call a canonical set of properties and relations of the parts which may or may not determine the properties and relations of the whole the supervenience basis. Holism and Nonseparability in Physics. Those listening are often left speechless, because no such support exists within canonical Islamic texts.