Sentence:  Another woman , addressing Christmas cards , said to her husband : `` We sent them one last year but they did n't send us one , so they probably won't send us one this <WSD>year</WSD> because they 'll think we won't send them one because they did n't last year , do n't you think , or shall we '' ? 
Meaning of the word marked with <WSD> tags:  a period of time containing 365 (or 366) days