In grammar, an intensive form of a word is one which denotes stronger or more forceful action as compared with the root on which the intensive is built. Intensives are usually lexical formations, but there may be a regular process for forming intensives from a base root. Intensive formations, for example, existed in Proto-Indo-European, and in many of the Semitic languages.
In Classical Arabic, Form II (faʿʿal-a) can form intensives, in addition to causatives; while form IV ('afʿal-a) forms only causitives. Hebrew has a similar distinction between the "pi`el" (intensive) and "hiph`il" (causative) binyans. Some Germanic languages have intensive prefixes or particles that can be attached to verbs; consider German zer-, which adds the meaning of "... into pieces", e.g. reißen "to rip" zerreißen "to rip to pieces".
Latin had verbal prefixes e- and per- that could be more or less freely added onto any verb and variously added such meanings as "to put a great deal of effort into doing something". When the same prefixes (per especially) were added onto adjectives, the resulting meaning was "very X" or "extremely X".
Intensive insulin therapy and mortality among critically ill patients: a meta-analysis including NICE-SUGAR study data
Apr 14, 2009; ABSTRACT Background: Hyperglycemia is associated with increased mortality in critically ill patients. Randomized trials of...