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.
Noun. 1. imperative-a mood that expresses an intention to influence the listener's behavior. imperative form, imperative mood, jussive mood.modality, mood, mode-verb inflections that express how the action or state is conceived by the speaker.mÂ·perÂ·aÂ·tive. adj. 1. Necessary or urgent: It is imperative that we continue to move with speed to make housing more affordable (Timothy Geithner). See Synonyms at urgent.