Sentence:  He turned from the flying trees to look ahead and saw with an inward boy 's eye again the great fieldstone house which , built on one of the many acres of ancestral land bordering the west harbor , had been Izaak 's bride-gift to his cousin wife as the last <WSD>century</WSD> ended . 
Meaning of the word marked with <WSD> tags:  a period of 100 years