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.
Part of the Computing fundamentals glossary: In programming, canonical means according to the rules.. And non-canonical means not according to the rules.. In the early Christian church, the canon was the officially chosen text. In The New Hacker's Dictionary, Eric Raymond tells us that the word meant reed in its Greek and Latin origin, and a certain length of reed came to be used as a standard measure.