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.
Imperative can be traced all the way back to the Latin word imperare, which means âto command.â This is the sense in which the word is used today in grammar, and you might have seen it going together with the words mood and sentence. The imperative mood is one of the four main verb moods in the English language. As opposed to verb tenses, which indicate time, moods indicate states. The imperative mood indicates the state of commanding. Hereâs an example of an imperative sentence: