Sentence:  <u>Finite <WSD>Dimensionality</WSD> of de Rham Cohomology:</u><!--no underlining or colon in original, but it's a heading, which I didn't know how to reproduce here--> / "Proposition 5.3.1."<!--preceding was boldfaced not italicized in original; following was italicized--> If the manifold M has a finite good cover, then its cohomology is finite dimensional. 
Meaning of the word marked with <WSD> tags:  The number of dimensions something has.