Sentence:  it's <WSD>time</WSD> for bed;  it's <WSD>time</WSD> to sleep;  we must wait for the right <WSD>time</WSD>;  it's <WSD>time</WSD> we were going 
Meaning of the word marked with <WSD> tags:  A particular moment or hour; the appropriate moment or hour for something (especially with prepositional phrase or imperfect subjunctive).