معنی کلمه :‌ torsion

That force with which a thread, wire, or rod of any material, returns, or tends to return, to a state of rest after it has been twisted; torsibility.

Stated; prescribed; ritual. 1. A book containing stated and prescribed forms, as of oaths, declarations, prayers, medical formulaæ, etc.; a book of precedents. 2. Prescribed form or model; formula.