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.
A canonical law issued by the Pope (or with his consent in the case of laws issued by an ecumenical council or congregation) is promulgated when it is published in Acta Apostolicae Sedis, and by default has the force of law three months after promulgation.