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. n. 1. (Philosophy) (in the ethics of Kant) the unconditional moral principle that one's behaviour should accord with universalizable maxims which respect persons as ends in themselves; the obligation to do one's duty for its own sake and not in pursuit of further ends.Compare hypothetical imperative. n.. (Philosophy) (in the ethics of Kant) the unconditional moral principle that one's behaviour should accord with universalizable maxims which respect persons as ends in themselves; the obligation to do one's duty for its own sake and not in pursuit of further ends. Compare hypothetical imperative. n.