Sentence:  On the validity of this slogan we do have some evidence; studies of library <WSD>usuage</WSD> indicate rather clearly that the library is not, in fact, the heart of the instructional program &mdash; that use of the library by students is mainly confined to assigned readings. <ref>Norman Burns. “M-P PLANS AND PROJECTS.” Merrill-Palmer Quarterly (1954-1958), vol. 4, no. 2, 1958, pp. 120–121. JSTOR, http://www.jstor.org/stable/23080724.</ref> 
Meaning of the word marked with <WSD> tags:  consumption or utilisation