Sentence:  One of the best-known examples of this method of argumentation applied to problems of universal grammar is the analysis of ergativity and <WSD>subjecthood</WSD> in Anderson (1976), a paper notable for its attention to data from a large number of languages and its continuing importance. 
Meaning of the word marked with <WSD> tags:  The condition or state of a word or expression, such as a noun phrase, being the subject of a sentence.