Sentence:  He took a midnight train out of Cleveland <WSD>Saturday</WSD> , without an official word to anybody , and has stayed away from newsmen on his train trip across the nation to Reno , Nev. , where his wife , former Olympic Diving Champion Zoe Ann Olsen , awaited . 
Meaning of the word marked with <WSD> tags:  the seventh and last day of the week; observed as the Sabbath by Jews and some Christians