Sentence:  A lecture which occupies more than one hour is always divided into two parts, by a break of a quarter of an hour in the middle, in order to prevent any weariness or inattention resulting from a long sitting. Great importance is attached to "<WSD>repetitoriums</WSD>," in which the ground of former lectures is glanced rapidly over, bringing out the most important points in the various subjects 
Meaning of the word marked with <WSD> tags:  A private class that augments a university course of studies by reviewing material, typically found in the German system.