COMMUNICATIONS RETINAL CYSTS ANDRETINOSCHISIS* BY C. G. KEITH DepartmentofPathology, Institute ofOphthalmology, University ofLondon SINCE the term retinoschisis came into commonophthalmological parlance, it has oftenbeenusedas thoughthe conditionwereadefinite entity, differing fromretinal cysts bythe process byWhichit arose.
The definition of imperative is something that has authority or is absolutely necessary. 1  An example of imperative is the power that a government has over its people.  An example of imperative is the decision to give a cesarean in a breach birth.
Categorical Imperative. Under the system of ethics described by German philosopher Immanuel Kant, a categorical imperative is an absolute moral obligation to do or not do something that applies to all rational beings, with no consideration for personal desires, motives, or inclinations. To explore this concept, consider the following categorical imperative definition.